coelurosaur
noun/sɪˈljʊərəsɔː(r)/
/sɪˈljʊrəsɔːr/
- a small thin dinosaur with long front legs, that is thought to be the ancestor of birdsWord Origin1950s: from Greek koilos ‘hollow’ + oura ‘tail’ + sauros ‘lizard’.
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coelurosaur