[{"Bold_text": "noun", "List Items": ["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.", "Also called gastric mill gastric mill.a similar structure in the foregut of arthropods and several other invertebrates, often lined with chitin and small teeth.", "the innards or viscera collectively, especially the intestine and stomach."]}]