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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.