The Collaborative International Dictionary of English v.0.48:

Boil \Boil\ (boil), v. i. [imp. & p. p. Boiled (boild); p. pr.
   & vb. n. Boiling.] [OE. boilen, OF. boilir, builir, F.
   bouillir, fr. L. bullire to be in a bubbling motion, from
   bulla bubble; akin to Gr. ?, Lith. bumbuls. Cf. Bull an
   edict, Budge, v., and Ebullition.]
   1. To be agitated, or tumultuously moved, as a liquid by the
      generation and rising of bubbles of steam (or vapor), or
      of currents produced by heating it to the boiling point;
      to be in a state of ebullition; as, the water boils.
      [1913 Webster]

   2. To be agitated like boiling water, by any other cause than
      heat; to bubble; to effervesce; as, the boiling waves.
      [1913 Webster]

            He maketh the deep to boil like a pot. --Job xii.
                                                  31.
      [1913 Webster]

   3. To pass from a liquid to an a["e]riform state or vapor
      when heated; as, the water boils away.
      [1913 Webster]

   4. To be moved or excited with passion; to be hot or fervid;
      as, his blood boils with anger.
      [1913 Webster]

            Then boiled my breast with flame and burning wrath.
                                                  --Surrey.
      [1913 Webster]

   5. To be in boiling water, as in cooking; as, the potatoes
      are boiling.
      [1913 Webster]

   To boil away, to vaporize; to evaporate or be evaporated by
      the action of heat.

   To boil over, to run over the top of a vessel, as liquid
      when thrown into violent agitation by heat or other cause
      of effervescence; to be excited with ardor or passion so
      as to lose self-control.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Boil \Boil\, n.
   Act or state of boiling. [Colloq.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Boil \Boil\, n. [Influenced by boil, v. See Beal, Bile.]
   A hard, painful, inflamed tumor, which, on suppuration,
   discharges pus, mixed with blood, and discloses a small
   fibrous mass of dead tissue, called the core.
   [1913 Webster]

   A blind boil, one that suppurates imperfectly, or fails to
      come to a head.

   Delhi boil (Med.), a peculiar affection of the skin,
      probably parasitic in origin, prevailing in India (as
      among the British troops) and especially at Delhi.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Boil \Boil\, v. t.
   1. To heat to the boiling point, or so as to cause
      ebullition; as, to boil water.
      [1913 Webster]

   2. To form, or separate, by boiling or evaporation; as, to
      boil sugar or salt.
      [1913 Webster]

   3. To subject to the action of heat in a boiling liquid so as
      to produce some specific effect, as cooking, cleansing,
      etc.; as, to boil meat; to boil clothes.
      [1913 Webster]

            The stomach cook is for the hall,
            And boileth meate for them all.       --Gower.
      [1913 Webster]

   4. To steep or soak in warm water. [Obs.]
      [1913 Webster]

            To try whether seeds be old or new, the sense can
            not inform; but if you boil them in water, the new
            seeds will sprout sooner.             --Bacon.
      [1913 Webster]

   To boil down, to reduce in bulk by boiling; as, to boil
      down sap or sirup.
      [1913 Webster]

WordNet (r) 3.0 (2006):

boil
    n 1: a painful sore with a hard core filled with pus [syn:
         boil, furuncle]
    2: the temperature at which a liquid boils at sea level; "they
       brought the water to a boil" [syn: boiling point, boil]
    v 1: come to the boiling point and change from a liquid to
         vapor; "Water boils at 100 degrees Celsius" [ant: freeze]
    2: immerse or be immersed in a boiling liquid, often for cooking
       purposes; "boil potatoes"; "boil wool"
    3: bring to, or maintain at, the boiling point; "boil this
       liquid until it evaporates"
    4: be agitated; "the sea was churning in the storm" [syn:
       churn, boil, moil, roil]
    5: be in an agitated emotional state; "The customer was seething
       with anger" [syn: seethe, boil]

Moby Thesaurus II by Grady Ward, 1.0:

287 Moby Thesaurus words for "boil":
   abscess, agitation, antisepticize, aposteme, autoclave, bake,
   barbecue, baste, be in heat, be livid, be pissed, bed sore, blain,
   blanch, blaze, bleb, blister, bloom, blow up, blubber, bluster,
   bobbery, boil over, boiling, bolt, braise, brew, bristle, broil,
   brouhaha, brown, browned off, bubble, bubble over, bubble up, bubo,
   bulla, bump, bunion, burble, burn, bustle, canker, canker sore,
   carbuncle, carry on, casserole, chafe, chancre, chancroid, charge,
   chase, chilblain, chlorinate, choke, churn, coction, coddle,
   cold sore, combust, commotion, conturbation, cook, corn, course,
   cover, culinary masterpiece, culinary preparation, curry, cyst,
   dash, decoct, decoction, decontaminate, delouse, devil, dilatation,
   dilation, discomposure, dish, disinfect, disorder, disquiet,
   disquietude, distension, distill, disturbance, do,
   do to perfection, ebullience, ebulliency, ebulliometer, ebullition,
   edema, effervesce, embroilment, entree, eschar, excitement, felon,
   ferment, fermentation, fester, festering, fever, fever blister,
   feverishness, fidgets, fire, fistula, fizz, fizzle, flame,
   flame up, flap, flare, flare up, flicker, fling, flurry, flush,
   fluster, flutteration, foam, foment, fret, fricassee, frizz,
   frizzle, fry, fulminate, fume, fumigate, furuncle, furunculus,
   fuss, gasp, gathering, glow, go on, griddle, grill, guggle,
   gumboil, gurgle, have a conniption, heat, hemorrhoids, hiss,
   hubbub, hurly-burly, hygienize, incandesce, inquietude,
   intumescence, jitters, jumpiness, kibe, lash, lesion, lump,
   maelstrom, main dish, malaise, moil, nerviness, nervosity,
   nervousness, oven-bake, pan, pan-broil, pant, papula, papule,
   parboil, parch, paronychia, parulis, pasteurize, perturbation,
   petechia, piles, pimple, pissed off, plop, poach, pock, polyp,
   prepare, prepare food, pustule, race, radiate heat, rage,
   raise Cain, raise hell, raise the devil, raise the roof, rant,
   rant and rave, rave, restlessness, rising, roast, roil, rout, row,
   sanitate, sanitize, saute, scab, scald, scallop, scorch, sear,
   sebaceous cyst, seethe, seething, shimmer with heat, shirr, shoot,
   side dish, simmer, simmering, sizzle, smoke, smolder, smother,
   smoulder, soft chancre, sore, spark, sparkle, splutter, sputter,
   steam, sterilize, stew, stewing, stifle, stigma, stir, stir-fry,
   storm, sty, suffocate, suppuration, sweat, swell, swelling,
   swelter, swirl, swollenness, take on, tear, throw a fit, to-do,
   toast, trepidation, trepidity, tubercle, tumefaction, tumescence,
   tumidity, tumor, tumult, tumultuation, turbidity, turbulence,
   turgescence, turgescency, turgidity, turmoil, twitter, ulcer,
   ulceration, unease, unrest, upset, wale, welt, wen, wheal, whelk,
   whitlow, work, wound



Easton's 1897 Bible Dictionary:

Boil
   (rendered "botch" in Deut. 28:27, 35), an aggravated ulcer, as
   in the case of Hezekiah (2 Kings 20:7; Isa. 38:21) or of the
   Egyptians (Ex. 9:9, 10, 11; Deut. 28:27, 35). It designates the
   disease of Job (2:7), which was probably the black leprosy.