[1] : The Collaborative International Dictionary of English v.0.48

gizzard \giz"zard\, n. f. g'esier, l. gigeria, pl., the
   cooked entrails of poultry. cf. gigerium.
   1913 webster
   1. anat. the second, or true, muscular stomach of birds, in
      which the food is crushed and ground, after being softened
      in the glandular stomach crop, or lower part of the
      esophagus; the gigerium.
      1913 webster

   2. zool.
      a a thick muscular stomach found in many invertebrate
          animals.
      b a stomach armed with chitinous or shelly plates or
          teeth, as in certain insects and mollusks.
          1913 webster

   gizzard shad zool., an american herring dorosoma
      cepedianum resembling the shad, but of little value.

   to fret the gizzard, to harass; to vex one's self; to
      worry. low --hudibras.

   to stick in one's gizzard, to be difficult of digestion; to
      be offensive. low
      1913 webster
see also:
gigerium gizzard shad dorosoma cepedianum to fret the gizzard to stick in one's gizzard 

[2] : WordNet (r) 2.0

gizzard
     n : thick-walled muscular pouch below the crop in many birds and
         reptiles for grinding food syn: ventriculus, gastric
         mill
see also:
ventriculus gastric mill 

[3] : Moby Thesaurus II by Grady Ward, 1.0

87 moby thesaurus words for "gizzard":
   abatis, abdomen, abomasum, anus, appendix, bay window, beerbelly,
   belly, blind gut, bowels, brain, brains, breadbasket, cecum,
   chitterlings, cockscomb, colon, craw, crop, diaphragm, duodenum,
   embonpoint, endocardium, entrails, first stomach, foregut, giblets,
   gullet, gut, guts, haslet, heart, hindgut, honeycomb stomach,
   innards, inner mechanism, insides, internals, intestine, inwards,
   jejunum, kidney, kidneys, kishkes, large intestine, liver,
   liver and lights, lung, manyplies, marrow, maw, midgut, midriff,
   omasum, paunch, perineum, pot, potbelly, potgut, psalterium, pump,
   pusgut, pylorus, rectum, rennet bag, reticulum, rumen,
   second stomach, small intestine, spare tire, spleen, stomach,
   swagbelly, sweetbread, third stomach, ticker, tongue, tripe,
   tripes, tum-tum, tummy, underbelly, ventripotence,
   vermiform appendix, viscera, vitals, works

Gizzard >> G Words
Gizzard, definition of term: Gizzard
gizzard_pag1.html

Gizzard Shad >> G Words
Gizzard Shad, definition of term: Gizzard Shad
gizzard+shad_pag1.html