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 archeopteryx archeopteryx /ˌɑːrkiːˈɒptərɪks/

noun

  1. Extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds  ( archaeopteryx , Archaeopteryx lithographica , archeopteryx )
    extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds