The Collaborative International Dictionary
Gigerium
Gigerium \Gi*ge"ri*um\, n.; pl. Gigeria. [NL., fr. L. gigeria, pl., the cooked entrails of poultry.] (Anat.) The muscular stomach, or gizzard, of birds.
Wiktionary
gigerium
n. (context anatomy English) The muscular stomach, or gizzard, of birds.