What is Gizzard?

Gizzard definition and meaning on Dictionary terms:
noun Zoology.
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. 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.

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