*gizzard*

n. [ F. gésier, 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 ]