The Collaborative International Dictionary of English v.0.48:

Belly \Bel"ly\ (b[e^]l"l[y^]), n.; pl. Bellies (-l[i^]z). [OE.
   bali, bely, AS. belg, b[ae]lg, b[ae]lig, bag, bellows, belly;
   akin to Icel. belgr bag, bellows, Sw. b[aum]lg, Dan. b[ae]lg,
   D. & G. balg, cf. W. bol the paunch or belly, dim. boly, Ir.
   bolg. Cf. Bellows, Follicle, Fool, Bilge.]
   1. That part of the human body which extends downward from
      the breast to the thighs, and contains the bowels, or
      intestines; the abdomen.
      [1913 Webster]

   Note: Formerly all the splanchnic or visceral cavities were
         called bellies; -- the lower belly being the abdomen;
         the middle belly, the thorax; and the upper belly, the
         head. --Dunglison.
         [1913 Webster]

   2. The under part of the body of animals, corresponding to
      the human belly.
      [1913 Webster]

            Underneath the belly of their steeds. --Shak.
      [1913 Webster]

   3. The womb. [Obs.]
      [1913 Webster]

            Before I formed thee in the belly I knew thee.
                                                  --Jer. i. 5.
      [1913 Webster]

   4. The part of anything which resembles the human belly in
      protuberance or in cavity; the innermost part; as, the
      belly of a flask, muscle, sail, ship.
      [1913 Webster]

            Out of the belly of hell cried I.     --Jonah ii. 2.
      [1913 Webster]

   5. (Arch.) The hollow part of a curved or bent timber, the
      convex part of which is the back.
      [1913 Webster]

   Belly doublet, a doublet of the 16th century, hanging down
      so as to cover the belly. --Shak.

   Belly fretting, the chafing of a horse's belly with a
      girth. --Johnson.

   Belly timber, food. [Ludicrous] --Prior.

   Belly worm, a worm that breeds or lives in the belly
      (stomach or intestines). --Johnson.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Belly \Bel"ly\, v. t. [imp. & p. p. Bellied; p. pr. & vb. n.
   Bellying.]
   To cause to swell out; to fill. [R.]
   [1913 Webster]

         Your breath of full consent bellied his sails. --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Belly \Bel"ly\, v. i.
   To swell and become protuberant, like the belly; to bulge.
   [1913 Webster]

         The bellying canvas strutted with the gale. --Dryden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

belly
    n 1: the region of the body of a vertebrate between the thorax
         and the pelvis [syn: abdomen, venter, stomach,
         belly]
    2: a protruding abdomen [syn: belly, paunch]
    3: a part that bulges deeply; "the belly of a sail"
    4: the hollow inside of something; "in the belly of the ship"
    5: the underpart of the body of certain vertebrates such as
       snakes or fish
    v 1: swell out or bulge out [syn: belly, belly out]

Moby Thesaurus II by Grady Ward, 1.0:

137 Moby Thesaurus words for "belly":
   abdomen, abomasum, ascender, back, bag, balloon, bastard type,
   bay window, beard, bed, bedrock, beerbelly, belly out, bevel,
   bilge, billow, black letter, body, bottom, bottom side, bouge,
   breadbasket, breech, bug, bulge, buttocks, cap, capital, case,
   convexity, counter, craw, crop, cylindricality, descender,
   diaphragm, dilate, distend, downside, em, embonpoint, en, face,
   fat-faced type, feet, first stomach, font, fundament, gizzard,
   globosity, globularity, goggle, groove, gullet, gut, hardpan,
   honeycomb stomach, italic, kishkes, letter, ligature, logotype,
   lower case, lower side, lowest layer, lowest level, majuscule,
   manyplies, maw, midriff, minuscule, nether side, nethermost level,
   nick, omasum, orbicularity, paunch, pi, pica, point, pooch, pop,
   pot, potbelly, potgut, pouch, pout, print, psalterium, pusgut,
   rennet bag, reticulum, rock bottom, roman, rotundity, rotundness,
   round out, roundness, rumen, sans serif, script, second stomach,
   shank, shoulder, small cap, small capital, spare tire,
   sphericality, sphericalness, sphericity, spheroidicity,
   spheroidity, stamp, stem, stomach, substratum, swagbelly, swell,
   swell out, third stomach, tum-tum, tummy, type, type body,
   type class, type lice, typecase, typeface, typefounders,
   typefoundry, underbelly, underlayer, underneath, underside,
   upper case, venter, ventripotence



Easton's 1897 Bible Dictionary:

Belly
   the seat of the carnal affections (Titus 1:12; Phil. 3:19; Rom.
   16:18). The word is used symbolically for the heart (Prov. 18:8;
   20:27; 22:18, marg.). The "belly of hell" signifies the grave or
   underworld (Jonah 2:2).