/giz"euhrd/ , n. Zool.
1. Also called ventriculus . a thick-walled, muscular pouch in the lower stomach of many birds and reptiles that grinds food, often with the aid of ingested stones or grit.
2. Also called gastric mill . a similar structure in the foregut of arthropods and several other invertebrates, often lined with chitin and small teeth.
3. the innards or viscera collectively, esp. the intestine and stomach.
[ 1325-75; ME giser giser, gezier (F gésier ) gigerium; cf. L gigeria, gizeria giblets, perh. ult. jigar liver ]