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Definition of bird
- 1a warm-blooded egg-laying vertebrate animal distinguished by the possession of feathers, wings, a beak, and typically by being able to fly: [as modifier]:the valley is teeming with bird life
- Class Aves; birds probably evolved in the Jurassic period from small dinosaurs that may already have been warm-blooded
- North Americananother way of saying flip someone the bird .
Old English brid 'chick, fledgling', of unknown origin