Gizzard /(?)/

Giz·zard

Gizzard

n.
  1. 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. (Anat.)
  2. A thick muscular stomach found in many invertebrate animals. (Zool.)

Phrases & Compounds
Gizzard shad
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.
To stick in one's gizzard
to be difficult of digestion; to be offensive.