ARCHAEOPTERYX
archaeopteryx, archeopteryx, Archaeopteryx lithographica
(noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds
Source: WordNet® 3.1
Noun
archaeopteryx (plural archaeopteryges)
Alternative spelling of archeopteryx
Source: Wiktionary
Ar`chæ*op"te*ryx, n. Etym: [Gr. (Paleon.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition