The Collaborative International Dictionary of English v.0.48:

Gutta \Gut"ta\, n.; pl. Guttae. [L.]
   1. A drop.
      [1913 Webster]

   2. (Arch.) One of a series of ornaments, in the form of a
      frustum of a cone, attached to the lower part of the
      triglyphs, and also to the lower faces of the mutules, in
      the Doric order; -- called also campana, and drop.
      [1913 Webster]

   Gutta serena [L., lit. serene or clear drop] (Med.),
      amaurosis.

   Gutt[ae] band (Arch.), the listel or band from which the
      gutt[ae] hang.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Drop \Drop\, v. t. [imp. & p. p. Droppedor Dropt; p. pr. &
   vb. n. Dropping.] [OE. droppen, AS. dropan, v. i. See
   Drop, n.]
   1. To pour or let fall in drops; to pour in small globules;
      to distill. "The trees drop balsam." --Creech.
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            The recording angel, as he wrote it down, dropped a
            tear upon the word and blotted it out forever.
                                                  --Sterne.
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   2. To cause to fall in one portion, or by one motion, like a
      drop; to let fall; as, to drop a line in fishing; to drop
      a courtesy.
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   3. To let go; to dismiss; to set aside; to have done with; to
      discontinue; to forsake; to give up; to omit.
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            They suddenly drop't the pursuit.     --S. Sharp.
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            That astonishing ease with which fine ladies drop
            you and pick you up again.            --Thackeray.
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            The connection had been dropped many years. -- Sir
                                                  W. Scott.
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            Dropping the too rough H in Hell and Heaven.
                                                  --Tennyson.
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   4. To bestow or communicate by a suggestion; to let fall in
      an indirect, cautious, or gentle manner; as, to drop hint,
      a word of counsel, etc.
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   5. To lower, as a curtain, or the muzzle of a gun, etc.
      [1913 Webster]

   6. To send, as a letter; as, please drop me a line, a letter,
      word.
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   7. To give birth to; as, to drop a lamb.
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   8. To cover with drops; to variegate; to bedrop.
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            Show to the sun their waved coats dropped with gold.
                                                  --Milton.
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   To drop a vessel (Naut.), to leave it astern in a race or a
      chase; to outsail it.
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The Collaborative International Dictionary of English v.0.48:

Drop \Drop\ (dr[o^]p), n. [OE. drope, AS. dropa; akin to OS.
   dropo, D. drop, OHG. tropo, G. tropfen, Icel. dropi, Sw.
   droppe; and Fr. AS. dre['o]pan to drip, drop; akin to OS.
   driopan, D. druipen, OHG. triofan, G. triefen, Icel.
   drj[=u]pa. Cf. Drip, Droop.]
   1. The quantity of fluid which falls in one small spherical
      mass; a liquid globule; a minim; hence, also, the smallest
      easily measured portion of a fluid; a small quantity; as,
      a drop of water.
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            With minute drops from off the eaves. --Milton.
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            As dear to me as are the ruddy drops
            That visit my sad heart.              -- Shak.
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            That drop of peace divine.            --Keble.
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   2. That which resembles, or that which hangs like, a liquid
      drop; as a hanging diamond ornament, an earring, a glass
      pendant on a chandelier, a sugarplum (sometimes
      medicated), or a kind of shot or slug.
      [1913 Webster]

   3. (Arch.)
      (a) Same as Gutta.
      (b) Any small pendent ornament.
          [1913 Webster]

   4. Whatever is arranged to drop, hang, or fall from an
      elevated position; also, a contrivance for lowering
      something; as:
      (a) A door or platform opening downward; a trap door; that
          part of the gallows on which a culprit stands when he
          is to be hanged; hence, the gallows itself.
      (b) A machine for lowering heavy weights, as packages,
          coal wagons, etc., to a ship's deck.
      (c) A contrivance for temporarily lowering a gas jet.
      (d) A curtain which drops or falls in front of the stage
          of a theater, etc.
      (e) A drop press or drop hammer.
      (f) (Mach.) The distance of the axis of a shaft below the
          base of a hanger.
          [1913 Webster]

   5. pl. Any medicine the dose of which is measured by drops;
      as, lavender drops.
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   6. (Naut.) The depth of a square sail; -- generally applied
      to the courses only. --Ham. Nav. Encyc.
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   7. Act of dropping; sudden fall or descent.
      [1913 Webster]

   Ague drop, Black drop. See under Ague, Black.

   Drop by drop, in small successive quantities; in repeated
      portions. "Made to taste drop by drop more than the
      bitterness of death." --Burke.

   Drop curtain. See Drop, n., 4.
      (d) .

   Drop forging. (Mech.)
      (a) A forging made in dies by a drop hammer.
      (b) The process of making drop forgings.

   Drop hammer (Mech.), a hammer for forging, striking up
      metal, etc., the weight being raised by a strap or similar
      device, and then released to drop on the metal resting on
      an anvil or die.

   Drop kick (Football), a kick given to the ball as it
      rebounds after having been dropped from the hands.

   Drop lake, a pigment obtained from Brazil wood. --Mollett.

   Drop letter, a letter to be delivered from the same office
      where posted.

   Drop press (Mech.), a drop hammer; sometimes, a dead-stroke
      hammer; -- also called drop.

   Drop scene, a drop curtain on which a scene is painted. See
      Drop, n., 4.
      (d) .

   Drop seed. (Bot.) See the List under Glass.

   Drop serene. (Med.) See Amaurosis.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Drop \Drop\, v. i.
   1. To fall in drops.
      [1913 Webster]

            The kindly dew drops from the higher tree,
            And wets the little plants that lowly dwell.
                                                  --Spenser.
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   2. To fall, in general, literally or figuratively; as, ripe
      fruit drops from a tree; wise words drop from the lips.
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            Mutilations of which the meaning has dropped out of
            memory.                               --H. Spencer.
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            When the sound of dropping nuts is heard. --Bryant.
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   3. To let drops fall; to discharge itself in drops.
      [1913 Webster]

            The heavens . . . dropped at the presence of God.
                                                  --Ps. lxviii.
                                                  8.
      [1913 Webster]

   4. To fall dead, or to fall in death; as, dropping like
      flies.
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            Nothing, says Seneca, so soon reconciles us to the
            thoughts of our own death, as the prospect of one
            friend after another dropping round us. --Digby.
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   5. To come to an end; to cease; to pass out of mind; as, the
      affair dropped. --Pope.
      [1913 Webster]

   6. To come unexpectedly; -- with in or into; as, my old
      friend dropped in a moment. --Steele.
      [1913 Webster]

            Takes care to drop in when he thinks you are just
            seated.                               --Spectator.
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   7. To fall or be depressed; to lower; as, the point of the
      spear dropped a little.
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   8. To fall short of a mark. [R.]
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            Often it drops or overshoots by the disproportion of
            distance.                             --Collier.
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   9. To be deep in extent; to descend perpendicularly; as, her
      main topsail drops seventeen yards.
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   To drop astern (Naut.), to go astern of another vessel; to
      be left behind; to slacken the speed of a vessel so as to
      fall behind and to let another pass a head.

   To drop down (Naut.), to sail, row, or move down a river,
      or toward the sea.

   To drop off, to fall asleep gently; also, to die. [Colloq.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

drop
    n 1: a shape that is spherical and small; "he studied the shapes
         of low-viscosity drops"; "beads of sweat on his forehead"
         [syn: drop, bead, pearl]
    2: a small indefinite quantity (especially of a liquid); "he had
       a drop too much to drink"; "a drop of each sample was
       analyzed"; "there is not a drop of pity in that man"; "years
       afterward, they would pay the blood-money, driblet by
       driblet"--Kipling [syn: drop, drib, driblet]
    3: a sudden sharp decrease in some quantity; "a drop of 57
       points on the Dow Jones index"; "there was a drop in pressure
       in the pulmonary artery"; "a dip in prices"; "when that
       became known the price of their stock went into free fall"
       [syn: drop, dip, fall, free fall]
    4: a steep high face of rock; "he stood on a high cliff
       overlooking the town"; "a steep drop" [syn: cliff, drop,
       drop-off]
    5: a predetermined hiding place for the deposit and distribution
       of illicit goods (such as drugs or stolen property)
    6: a free and rapid descent by the force of gravity; "it was a
       miracle that he survived the drop from that height" [syn:
       drop, fall]
    7: a curtain that can be lowered and raised onto a stage from
       the flies; often used as background scenery [syn: drop
       curtain, drop cloth, drop]
    8: a central depository where things can be left or picked up
    9: the act of dropping something; "they expected the drop would
       be successful"
    v 1: let fall to the ground; "Don't drop the dishes"
    2: to fall vertically; "the bombs are dropping on enemy targets"
    3: go down in value; "Stock prices dropped"
    4: fall or descend to a lower place or level; "He sank to his
       knees" [syn: sink, drop, drop down]
    5: terminate an association with; "drop him from the Republican
       ticket"
    6: utter with seeming casualness; "drop a hint"; drop names"
    7: stop pursuing or acting; "drop a lawsuit"; "knock it off!"
       [syn: drop, knock off]
    8: leave or unload; "unload the cargo"; "drop off the passengers
       at the hotel" [syn: drop, drop off, set down, put
       down, unload, discharge]
    9: cause to fall by or as if by delivering a blow; "strike down
       a tree"; "Lightning struck down the hikers" [syn: fell,
       drop, strike down, cut down]
    10: lose (a game); "The Giants dropped 11 of their first 13"
    11: pay out; "spend money" [syn: spend, expend, drop]
    12: lower the pitch of (musical notes) [syn: flatten, drop]
        [ant: sharpen]
    13: hang freely; "the ornaments dangled from the tree"; "The
        light dropped from the ceiling" [syn: dangle, swing,
        drop]
    14: stop associating with; "They dropped her after she had a
        child out of wedlock" [syn: dismiss, send packing, send
        away, drop]
    15: let or cause to fall in drops; "dribble oil into the
        mixture" [syn: dribble, drip, drop]
    16: get rid of; "he shed his image as a pushy boss"; "shed your
        clothes" [syn: shed, cast, cast off, shake off,
        throw, throw off, throw away, drop]
    17: take (a drug, especially LSD), by mouth; "She dropped acid
        when she was a teenager"
    18: omit (a letter or syllable) in speaking or writing; " New
        Englanders drop their post-vocalic r's"
    19: leave undone or leave out; "How could I miss that typo?";
        "The workers on the conveyor belt miss one out of ten" [syn:
        neglect, pretermit, omit, drop, miss, leave out,
        overlook, overleap] [ant: attend to, take to heart]
    20: change from one level to another; "She dropped into army
        jargon"
    21: fall or sink into a state of exhaustion or death; "shop til
        you drop"
    22: grow worse; "Her condition deteriorated"; "Conditions in the
        slums degenerated"; "The discussion devolved into a shouting
        match" [syn: devolve, deteriorate, drop, degenerate]
        [ant: convalesce, recover, recuperate]
    23: give birth; used for animals; "The cow dropped her calf this
        morning"

Moby Thesaurus II by Grady Ward, 1.0:

741 Moby Thesaurus words for "drop":
   abandon, abate, abdicate, abeyance, abjure, ablate,
   acknowledge defeat, act drop, advantage, asbestos, asbestos board,
   ascend, ax, backdrop, backslide, balm, balsam, bank, bate, batten,
   be bereaved of, be confined, be eaten away, bead, bear,
   bear a child, bear young, belly buster, belly flop, belly whopper,
   bit, black out, block, blow, blow down, blow over, blow to pieces,
   blow up, boot out, border, bounce, bowl down, bowl over, brain,
   break, break down, break the habit, bring down, bulge, bulldog,
   burn out, burn to death, caesura, call off, call on, calve, can,
   cannonball, cant, careen, cascade, cash in, cast, cast down,
   cast off, catabasis, cataract, cave in, cease, cease-fire, cede,
   charge, chop down, chuck, chute, climb, cloth, cock,
   coign of vantage, collapse, come apart, come by, come down,
   come off, come unstuck, comedown, condensation, condense, conk out,
   consume, consume away, corrode, coulisse, counterweight, crack up,
   crash, crash dive, cross, crumb, crumble, cry quits, curtain,
   curtain board, cut down, cut out, cut to pieces, cyclorama, dab,
   dash, dash down, day off, deal a deathblow, death chair,
   death chamber, debacle, debasement, decadence, decadency, decamp,
   decease, deceleration, deck, declension, declination, decline,
   decline and fall, declivity, decor, decrease, decrescendo,
   deepness, default, defluxion, deformation, degeneracy,
   degenerateness, degeneration, degradation, deliquesce, demise,
   demotion, depart, deposit, depravation, depravedness, depreciation,
   derogation, descend, descending, descension, descent, desert,
   desist, desist from, deterioration, detonate, devolution, dewdrop,
   die, die away, diminish, diminuendo, dip, dip down, discard,
   discharge, discontinue, disgorge, disintegrate, dismiss,
   dispense with, dispose of, distill, distillation, disuse, ditch,
   dive, do without, doff, dot, douse, down, downbend, downcome,
   downcurve, downfall, downflow, downgate, downgrade, downhill,
   downpour, downrush, downslide, downswing, downtrend, downturn,
   downward mobility, downward trend, draft, dram, drench, dribble,
   driblet, drink, drip, dripping, drippings, dripple, droop, drop,
   drop curtain, drop down, drop in on, drop off, drop out, droplet,
   dropping, drops, drug, dump, dwindle, dwindling, dying, ebb, edge,
   effeteness, eject, electric chair, electuary, eliminate, elixir,
   end, erode, ethical drug, exclude, expire, fade, fading, fail,
   failing, failure, failure of nerve, faint, fall, fall away,
   fall down, fall off, fall senseless, falling, falling-off, falloff,
   farrow, fatigue, fawn, fell, fetch down, filter, fire,
   fire curtain, fire off, fizzle out, flag, flat, fleck, flipper,
   floor, flying start, flyspeck, foal, forfeit, forgo, forsake,
   forswear, frag, gainer, gallows, gallows-tree, gargle, gas chamber,
   gasp, generic name, get along without, get rid of, get tired,
   gibbet, give away, give birth, give out, give over,
   give the quietus, give up, give way, globule, gnat, go astray from,
   go away, go down, go downhill, go off, go soft, go to pieces,
   go uphill, gobbet, grade, grain, gravitate, gravitation, gray out,
   ground, grow weary, guillotine, gun, gun down, gun for, gurgle,
   guzzle, halter, hand over, hang, hanging, have, have a baby,
   have done with, have young, head, head start, header, hemp,
   hempen collar, herbs, hesitation, hew down, hit, hit the skids,
   holiday, hot seat, incinerate, inclination, incline, incur loss,
   inhalant, inside track, interim, interlude, intermezzo,
   intermission, intermittence, interruption, interval, involution,
   iota, jackknife, jade, jigger, jilt, jolt, jot, jugulate, jump,
   keel, keel over, kick, kiss good-bye, kitten, knock down, labor,
   lamb, languish, lapidate, lapse, lay, lay down, lay level, lay low,
   lay out, layoff, leach, leaching, lead, leak, leak out, leakage,
   leaking, lean, leave, leave off, leave out, lessen, let drop,
   let fly, let go, let off, let out, let slip, let up,
   lethal chamber, letter box, letter drop, letup, level, libation,
   lie in, lincture, linctus, list, litter, lixiviate, lixiviation,
   load, lose, lose altitude, lose out, loss of tone, lota, lower,
   lull, maiden, mailbag, mailbox, mailing machine, make a sacrifice,
   materia medica, medicament, medication, medicinal, medicinal herbs,
   medicine, melt away, microbe, microorganism, midge, minim, minutia,
   minutiae, mislay, misplace, miss, mite, mixture, molecule, mote,
   mow down, nip, nol-pros, nonprescription drug, noose, nose dive,
   nose-dive, not pursue with, odds, officinal, omit, ounce, oust,
   pant, parachute, parachute jump, part with, particle, pass,
   pass away, pass out, patent medicine, pause, pearl, peg, peg out,
   pelt, pepper, percolate, percolation, peter out, pharmacon, physic,
   pick off, pillar box, pinch, pine, pinhead, pinpoint, pistol,
   pitch, play out, plop, plug, plummet, plummeting, plump, plunge,
   plunk, point, poleax, poop out, pop off, postbag, postbox, pot,
   potation, potion, potshoot, potshot, pounce, pounce on,
   pounce upon, pour down, powder, power dive, precipitate,
   preparation, prescription drug, prime, proprietary,
   proprietary medicine, proprietary name, prostrate, puff,
   puff and blow, pull, pull down, pup, put behind one, put off, quit,
   quitclaim, rag, rain, raindrop, rake, rapids, rase, raze, recant,
   recess, regression, reject, relapse, release, relinquish,
   remission, remove, render up, renounce, repudiate, resign, respite,
   rest, retract, retreat, retrocession, retrogradation,
   retrogression, riddle, rise, rope, round, round of drinks,
   run down, run low, run out, running dive, running start, rusticate,
   sack, sacrifice, sag, scaffold, scene, scenery, scrap, screen,
   scrub, seep, seepage, seeping, send headlong, settle, shake, shed,
   shelve, shoot, shoot at, shoot down, shoot to death, shot, shotgun,
   shred, shrink, side scene, sidle, silence, simples, sink, sip,
   skid, skin-dive, sky dive, sky-dive, slack off, slacken, slant,
   slide, slip, slip out of, slippage, slope, slowdown, slug, slump,
   smidgen, smidgin, smitch, snifter, snip, snipe, snippet, snort,
   something extra, something in reserve, sound, spare, spawn, speck,
   spot, spread-eagle, spurtle, stab to death, stage screw, stake,
   stand-down, start, stationary dive, stay, step out of, stone,
   stone to death, stoop, stop, strike, strike dead, subside,
   subsidence, succumb, suck, suffer loss, sup, supinate, surrender,
   suspension, swag, swan dive, sway, swear off, sweat, sweating,
   swig, swill, swoon, swoop, swoop down, syrup, tab, tableau,
   tail off, take a header, take a potshot, take down, take off,
   taper off, taste, tear, teardrop, teaser, tend, tend to go,
   terminate, the chair, theraputant, throw, throw down, throw off,
   throw over, throw up, tilt, tip, tire, tisane, tittle, topple,
   tormentor, torpedo, tot, transformation, transformation scene,
   travail, tree, trend downward, trickle, tricklet, trill, trip,
   truce, tumble, turn off, undergo privation, undo, unwrap,
   upper hand, uprise, vacate, vacation, vanishing point, vantage,
   vantage ground, vantage point, vaporize, vegetable remedies, visit,
   waive, wander from, wane, waste, waste away, waterfall, weaken,
   wear, wear away, wear thin, weary, weep, wet, whack down, wheeze,
   whelp, whip hand, wilt, wing, wingcut, withdraw from, woodcut,
   yean, yield