The Collaborative International Dictionary of English v.0.48:

Burn \Burn\ (b[^u]rn), v. t. [imp. & p. p. Burned (b[^u]rnd)
   or Burnt (b[^u]rnt); p. pr. & vb. n. Burning.] [OE.
   bernen, brennen, v. t., early confused with beornen, birnen,
   v. i., AS. b[ae]rnan, bernan, v. t., birnan, v. i.; akin to
   OS. brinnan, OFries. barna, berna, OHG. brinnan, brennan, G.
   brennen, OD. bernen, D. branden, Dan. br[ae]nde, Sw.
   br[aum]nna, brinna, Icel. brenna, Goth. brinnan, brannjan (in
   comp.), and possibly to E. fervent.]
   1. To consume with fire; to reduce to ashes by the action of
      heat or fire; -- frequently intensified by up: as, to burn
      up wood. "We'll burn his body in the holy place." --Shak.
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   2. To injure by fire or heat; to change destructively some
      property or properties of, by undue exposure to fire or
      heat; to scorch; to scald; to blister; to singe; to char;
      to sear; as, to burn steel in forging; to burn one's face
      in the sun; the sun burns the grass.
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   3. To perfect or improve by fire or heat; to submit to the
      action of fire or heat for some economic purpose; to
      destroy or change some property or properties of, by
      exposure to fire or heat in due degree for obtaining a
      desired residuum, product, or effect; to bake; as, to burn
      clay in making bricks or pottery; to burn wood so as to
      produce charcoal; to burn limestone for the lime.
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   4. To make or produce, as an effect or result, by the
      application of fire or heat; as, to burn a hole; to burn
      charcoal; to burn letters into a block.
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   5. To consume, injure, or change the condition of, as if by
      action of fire or heat; to affect as fire or heat does;
      as, to burn the mouth with pepper.
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            This tyrant fever burns me up.        --Shak.
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            This dry sorrow burns up all my tears. --Dryden.
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            When the cold north wind bloweth, . . . it devoureth
            the mountains, and burneth the wilderness, and
            consumeth the ??ass as fire.          --Ecclus.
                                                  xliii. 20, 21.
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   6. (Surg.) To apply a cautery to; to cauterize.
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   7. (Chem.) To cause to combine with oxygen or other active
      agent, with evolution of heat; to consume; to oxidize; as,
      a man burns a certain amount of carbon at each
      respiration; to burn iron in oxygen.
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   To burn, To burn together, as two surfaces of metal
      (Engin.), to fuse and unite them by pouring over them a
      quantity of the same metal in a liquid state.

   To burn a bowl (Game of Bowls), to displace it
      accidentally, the bowl so displaced being said to be
      burned.

   To burn daylight, to light candles before it is dark; to
      waste time; to perform superfluous actions. --Shak.

   To burn one's fingers, to get one's self into unexpected
      trouble, as by interfering the concerns of others,
      speculation, etc.

   To burn out,
      (a) to destroy or obliterate by burning. "Must you with
          hot irons burn out mine eyes?" --Shak.
      (b) to force (people) to flee by burning their homes or
          places of business; as, the rioters burned out the
          Chinese businessmen.

   To be burned out, to suffer loss by fire, as the burning of
      one's house, store, or shop, with the contents.

   To burn up, To burn down, to burn entirely.
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The Collaborative International Dictionary of English v.0.48:

Burn \Burn\, n.
   1. A hurt, injury, or effect caused by fire or excessive or
      intense heat.
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   2. The operation or result of burning or baking, as in
      brickmaking; as, they have a good burn.
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   3. A disease in vegetables. See Brand, n., 6.
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The Collaborative International Dictionary of English v.0.48:

Burn \Burn\, v. i.
   1. To be of fire; to flame. "The mount burned with fire."
      --Deut. ix. 15.
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   2. To suffer from, or be scorched by, an excess of heat.
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            Your meat doth burn, quoth I.         --Shak.
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   3. To have a condition, quality, appearance, sensation, or
      emotion, as if on fire or excessively heated; to act or
      rage with destructive violence; to be in a state of lively
      emotion or strong desire; as, the face burns; to burn with
      fever.
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            Did not our heart burn within us, while he talked
            with us by the way?                   --Luke xxiv.
                                                  32.
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            The barge she sat in, like a burnished throne,
            Burned on the water.                  --Shak.
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            Burning with high hope.               --Byron.
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            The groan still deepens, and the combat burns.
                                                  --Pope.
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            The parching air
            Burns frore, and cold performs the effect of fire.
                                                  --Milton.
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   4. (Chem.) To combine energetically, with evolution of heat;
      as, copper burns in chlorine.
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   5. In certain games, to approach near to a concealed object
      which is sought. [Colloq.]
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   To burn up, To burn down, to be entirely consumed.
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The Collaborative International Dictionary of English v.0.48:

Burn \Burn\, n. [See 1st Bourn.]
   A small stream. [Scot.]
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WordNet (r) 3.0 (2006):

burn
    n 1: pain that feels hot as if it were on fire [syn: burn,
         burning]
    2: a browning of the skin resulting from exposure to the rays of
       the sun [syn: tan, suntan, sunburn, burn]
    3: an injury caused by exposure to heat or chemicals or
       radiation
    4: a place or area that has been burned (especially on a
       person's body) [syn: burn, burn mark]
    5: damage inflicted by fire
    v 1: destroy by fire; "They burned the house and his diaries"
         [syn: burn, fire, burn down]
    2: shine intensely, as if with heat; "The coals were glowing in
       the dark"; "The candles were burning" [syn: burn, glow]
    3: undergo combustion; "Maple wood burns well" [syn: burn,
       combust]
    4: cause a sharp or stinging pain or discomfort; "The sun burned
       his face" [syn: bite, sting, burn]
    5: cause to burn or combust; "The sun burned off the fog"; "We
       combust coal and other fossil fuels" [syn: burn, combust]
    6: feel strong emotion, especially anger or passion; "She was
       burning with anger"; "He was burning to try out his new
       skies"
    7: cause to undergo combustion; "burn garbage"; "The car burns
       only Diesel oil" [syn: burn, incinerate]
    8: burn at the stake; "Witches were burned in Salem"
    9: spend (significant amounts of money); "He has money to burn"
    10: feel hot or painful; "My eyes are burning"
    11: burn, sear, or freeze (tissue) using a hot iron or electric
        current or a caustic agent; "The surgeon cauterized the
        wart" [syn: cauterize, cauterise, burn]
    12: get a sunburn by overexposure to the sun [syn: sunburn,
        burn]
    13: create by duplicating data; "cut a disk"; "burn a CD" [syn:
        cut, burn]
    14: use up (energy); "burn off calories through vigorous
        exercise" [syn: burn off, burn, burn up]
    15: burn with heat, fire, or radiation; "The iron burnt a hole
        in my dress"

Moby Thesaurus II by Grady Ward, 1.0:

506 Moby Thesaurus words for "burn":
   Earth insertion, LEM, LM, abrade, abrasion, adolescent stream,
   afflict, agonize, ail, air-dry, altitude peak, anhydrate, apogee,
   arroyo, assault, attack, attitude-control rocket,
   automatic control, bake, ballistic capsule, bank, barbarize, bark,
   batter, be bright, be in heat, be livid, be pissed, be warm,
   beacon, beam, beat, beat down, beck, bedazzle, beguile of, behead,
   bilk, bite, blacken, blast-off, blaze, blaze up, blemish, blind,
   blister, bloody, bloom, blot, blow down, blow up, bluster, boil,
   boil over, bourn, bowstring, braided stream, branch, brand, break,
   break down, bring down, bristle, broil, bronze, brook, brooklet,
   brown, browned off, brush, brutalize, bulldoze, bunco, burn down,
   burn in, burn off, burning, burning pain, burnout,
   burst into flame, butcher, capsule, carry on, cast, cast down,
   catch, catch fire, catch on fire, cauterize, ceiling, chafe,
   channel, char, cheat, check, chip, chisel, choke, chop down,
   chouse, chouse out of, claw, coal, cog, cog the dice, combust, con,
   concussion, conflagrate, consume, convulse, cook, cozen, crack,
   crackle, craze, creek, cremate, crib, crick, crucify, cupel, cure,
   cut, cut down, daze, dazzle, decapitate, decollate,
   deep-space ship, defenestrate, defraud, dehumidify, dehydrate,
   descent, desiccate, desire, destroy, diddle, diffuse light,
   distress, do in, do out of, docking, docking maneuver, drain, dry,
   electrocute, embrown, end of burning, enkindle, euchre, evaporate,
   excruciate, execute, exsiccate, fan the flame, feed, feed the fire,
   fell, ferry rocket, fester, finagle, fire, flam, flame, flame up,
   flare, flare up, flash, flash burn, flatten, fleece, flicker,
   flight, flimflam, flowing stream, flush, fluviation, fob, found,
   fracture, fray, frazzle, fresh, freshet, fret, fritter away, fry,
   fudge, fuel ship, fulgurate, fume, gall, garrote, gash, gasp,
   get wind of, gill, give light, give pain, glance, glare, gleam,
   glint, glow, gnaw, go on, gouge, gripe, guillotine, gull, gyp,
   hammer, harrow, have, have a conniption, hocus, hocus-pocus, hurt,
   ignite, ignition, impact, incandesce, incinerate, incise, incision,
   inflame, inflict capital punishment, inflict pain, infuscate,
   injection, injure, injury, insertion, insolate, irritate, itch,
   kill, kill by inches, kiln, kindle, knock down, knock over,
   lacerate, laceration, lapidate, launch, lay waste, lazy stream,
   lesion, level, lift-off, light, light up, long, loot,
   lunar excursion module, lunar module, luster, maim,
   make mincemeat of, manned rocket, martyr, martyrize, mat burn,
   maul, meandering stream, melt, midchannel, midstream, millstream,
   module, moon ship, mortal wound, moving road, mow down, mug, mulct,
   multistage rocket, mummify, mutilate, mutilation, navigable river,
   nip, nose out, orbit, overreach, oxidate, oxidize, pack the deal,
   pain, pant, parch, parking orbit, perigee, pierce, pigeon, pillage,
   pinch, pissed off, practice fraud upon, prick, prolong the agony,
   prostrate, pull down, puncture, put to death, put to torture,
   pyrolyze, race, racing stream, rack, radiate, radiate heat, rage,
   raise Cain, raise hell, raise the devil, raise the roof, ramp,
   rampage, rankle, rant, rant and rave, rape, rase, rasp, rave, raze,
   ream, reduce to ashes, reentry, rekindle, relight, relume, rend,
   rent, riot, rip, river, rivulet, roar, roast, rocket,
   rocket launching, rook, rub, ruin, run, rundle, runlet, runnel,
   rupture, rust, sack, savage, scald, scam, scent, scorch, scotch,
   scrape, scratch, screw, scuff, sear, second-degree burn, seethe,
   sell gold bricks, send out rays, set fire to, set on fire, shave,
   shimmer with heat, shine, shine brightly, shoot, shoot out rays,
   shortchange, shot, shrivel, shuttle rocket, sike, simmer, singe,
   sizzle, skin, slash, slaughter, slit, smart, smarting, smash,
   smell, smell out, smoke, smolder, smother, smoulder, sniff,
   sniff out, soak up, soft landing, solder, sore, sow chaos,
   space capsule, space docking, space rocket, spacecraft, spaceship,
   spark, spill stream, sponge, sprain, sputter, squander, stab,
   stab wound, stack the cards, steam, steamroller, stew, stick,
   stifle, sting, stinging, stir the fire, stoke, stoke the fire,
   stone, storm, strain, strangle, stream, stream action, streamlet,
   strike a light, subterranean river, suffocate, sun, sun-dry,
   sunburn, sunscald, suntan, swab, sweat, swelter, swindle, swinge,
   take, take a dive, take down, take on, tan, tear, tear around,
   tear down, terrorize, thimblerig, third-degree burn, throw a fight,
   throw a fit, throw away, throw down, tingle, tingling, toast,
   torch, torment, torrefy, torture, touch off, towel, trajectory,
   trauma, traumatize, tweak, twist, urtication, use, vandalize,
   velocity peak, vesicate, victimize, violate, vulcanize, wadi, warm,
   waste, watercourse, waterway, weazen, weld, windburn, wipe, wish,
   wither, wizen, wound, wounds immedicable, wreck, wrench, wring,
   yearn