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gizzard
The gizzard, also referred to as the ventriculus, gastric mill, and gigerium, is an organ found in the digestive tract of some animals, including archosaurs (dinosaurs, birds, pterosaurs, crocodiles and alligators), earthworms, some gastropods, some fish and some crustaceans. This specialized stomach constructed of thick muscular walls is used for grinding up food, often aided by particles of stone or grit. In certain insects and molluscs, the gizzard features chitinous plates or teeth.
==Etymology==
The word "gizzard" comes from the Middle English ''giser'', which derives from a similar word in Old French, which itself evolved from the Latin ''gigeria'', meaning giblets.〔(【引用サイトリンク】title=Gizzard )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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