‖Ar′chæ‐op″te‐ryx (�), n. [Gr. αρχαἰ̑οσ ancient + πτέρυξ wing.] (Paleon.) A fossil bird, of the Jurassic period, remarkable for having a long tapering tail of many vertebræ with feathers along each side, and jaws armed with teeth, with other reptilian characteristics.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.