gizzard (n.)
"stomach of a bird," late 14c., from Old French gisier (Modern French gésier) "entrails, giblets (of a bird)," probably from Vulgar Latin *gicerium, dissimilated from Latin gigeria (neuter plural) "cooked entrails of a fowl," a delicacy in ancient Rome, from PIE *yekwr- "liver" (see hepatitis). Parasitic -d added 1500s. Later extended to other animals, and, jocularly, to human beings.