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subclass archaeornithes is a noun meaning "primitive reptile-like fossil birds of the Jurassic or early Cretaceous". It carries one recorded sense.
primitive reptile-like fossil birds of the Jurassic or early Cretaceous
Definitions, synonyms and semantic relations for subclass archaeornithes come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.