- 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.
- 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.
- the thick-walled part of a bird's stomach, in which hard food is broken up by muscular action and contact with grit and small stones
- a similar structure in many invertebrates
- the stomach and entrails generally
