‖Ar‐chip′te‐ryg″i‐um (är‐kĭp′tē̍‐rĭj″ĭ‐ŭm), n. [NL., fr. Gr. pref. αρχἰ- (E. arch-) + πτερύγιον wing, fin.] (Anat.) The primitive form of fin, like that of Ceratodus.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.