Definition: gizzard

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Source: WordNet (r) 1.7 

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

Source: Webster's Revised Unabridged Dictionary (1913) 

Gizzard \Giz"zard\, n. [F. g['e]sier, L. gigeria, pl., the
   cooked entrails of poultry. Cf. Gigerium.]
   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.

   2. (Zo["o]l.)
      (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.

   Gizzard shad (Zo["o]l.), 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]