A muscular pouch in a bird's digestive system that grinds up food, or loosely, someone's stomach or courage.
From Middle English 'gisere', from Old French 'gésier', from Latin 'gigeria' (plural of 'gigerium'), originally referring to entrails or offal of birds.
A chicken's gizzard is basically a portable rock tumbler—birds swallow pebbles that lodge there and help grind seeds and grain without the bird needing teeth. It's why dinosaurs also had gizzards despite being reptiles, proving this grinding organ is ancient engineering.
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