The Collaborative International Dictionary of English v.0.48:

Leach \Leach\, n. (Naut.)
   See 3d Leech.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Leach \Leach\, n. [Written also letch.] [Cf. As. le['a]h lye,
   G. lauge. See Lye.]
   1. A quantity of wood ashes, through which water passes, and
      thus imbibes the alkali.
      [1913 Webster]

   2. A tub or vat for leaching ashes, bark, etc.
      [1913 Webster]

   Leach tub, a wooden tub in which ashes are leached.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Leach \Leach\, v. t. [imp. & p. p. Leached; p. pr. & vb. n.
   Leaching.] [Written also leech and letch.]
   1. To remove the soluble constituents from by subjecting to
      the action of percolating water or other liquid; as, to
      leach ashes or coffee.
      [1913 Webster]

   2. To dissolve out; -- often used with out; as, to leach out
      alkali from ashes.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Leach \Leach\, v. i.
   To part with soluble constituents by percolation.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Leach \Leach\, n.
   See Leech, a physician. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Leech \Leech\, n. [Cf. LG. leik, Icel. l[imac]k, Sw. lik
   boltrope, st[*a]ende liken the leeches.] (Naut.)
   The border or edge at the side of a sail. [Written also
   leach.]
   [1913 Webster]

   Leech line, a line attached to the leech ropes of sails,
      passing up through blocks on the yards, to haul the
      leeches by. --Totten.

   Leech rope, that part of the boltrope to which the side of
      a sail is sewed.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Leech \Leech\, n. [OE. leche, l[ae]che, physician, AS. l[=ae]ce;
   akin to Fries. l[=e]tza, OHG. l[=a]hh[imac], Icel.
   l[ae]knari, Sw. l[aum]kare, Dan. l[ae]ge, Goth. l[=e]keis,
   AS. l[=a]cnian to heal, Sw. l[aum]ka, Dan. l[ae]ge, Icel.
   l[ae]kna, Goth. l[=e]kin[=o]n.]
   1. A physician or surgeon; a professor of the art of healing.
      [Written also leach.] [Archaic] --Spenser.
      [1913 Webster]

            Leech, heal thyself.                  --Wyclif (Luke
                                                  iv. 23).

   2. (Zool.) Any one of numerous genera and species of annulose
      worms, belonging to the order Hirudinea, or Bdelloidea,
      esp. those species used in medicine, as Hirudo
      medicinalis of Europe, and allied species.
      [1913 Webster]

   Note: In the mouth of bloodsucking leeches are three
         convergent, serrated jaws, moved by strong muscles. By
         the motion of these jaws a stellate incision is made in
         the skin, through which the leech sucks blood till it
         is gorged, and then drops off. The stomach has large
         pouches on each side to hold the blood. The common
         large bloodsucking leech of America (Macrobdella
         decora) is dark olive above, and red below, with black
         spots. Many kinds of leeches are parasitic on fishes;
         others feed upon worms and mollusks, and have no jaws
         for drawing blood. See Bdelloidea. Hirudinea, and
         Clepsine.
         [1913 Webster]

   3. (Surg.) A glass tube of peculiar construction, adapted for
      drawing blood from a scarified part by means of a vacuum.
      [1913 Webster]

   Horse leech, a less powerful European leech (H[ae]mopis
      vorax), commonly attacking the membrane that lines the
      inside of the mouth and nostrils of animals that drink at
      pools where it lives.
      [1913 Webster]

WordNet (r) 3.0 (2006):

leach
    n 1: the process of leaching [syn: leach, leaching]
    v 1: cause (a liquid) to leach or percolate
    2: permeate or penetrate gradually; "the fertilizer leached into
       the ground" [syn: leach, percolate]
    3: remove substances from by a percolating liquid; "leach the
       soil" [syn: leach, strip]

Moby Thesaurus II by Grady Ward, 1.0:

137 Moby Thesaurus words for "leach":
   abate, abrade, abstract, bate, bathe, bleed, bolt, brew,
   chemical solution, clarify, clear, colliquate, condense, curtail,
   cut, decoagulate, decoct, decoction, decrassify, decrease, deduct,
   deliquesce, depreciate, depurate, derogate, detract, diminish,
   discharge, disparage, dissolve, distill, douche, drain, drench,
   dribble, drip, dripple, drop, drouk, eat away, edulcorate, effuse,
   elute, emit, erode, essentialize, excrete, exfiltrate, extract,
   extravasate, exudate, exude, file away, filter, filtrate, fluidify,
   fluidize, flush, flux, fuse, give off, gurgle, hold in solution,
   imbrue, imbue, impair, impregnate, infiltrate, infuse, infusion,
   inject, lave, leachate, lessen, liquefy, liquesce, liquidize,
   lixiviate, lixivium, macerate, melt, melt down, mixture, ooze,
   percolate, permeate, purify, rectify, reduce, reek, refine, remove,
   retrench, rinse, rub away, run, saturate, screen, seep, seethe,
   separate, shorten, sieve, sift, soak, sodden, solubilize, solution,
   solve, sop, souse, spiritualize, spurtle, steep, strain, subduct,
   sublimate, sublime, subtract, sweat, take away, take from, thaw,
   thin, thin out, transpire, transude, trickle, try, unclot, wash,
   waterlog, wear away, weed, weep, winnow, withdraw



U.S. Gazetteer Places (2000):

Leach, OK -- U.S. Census Designated Place in Oklahoma
   Population (2000):    220
   Housing Units (2000): 94
   Land area (2000):     6.229575 sq. miles (16.134524 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    6.229575 sq. miles (16.134524 sq. km)
   FIPS code:            41900
   Located within:       Oklahoma (OK), FIPS 40
   Location:             36.197845 N, 94.913359 W
   ZIP Codes (1990):     74364
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Leach, OK
    Leach