Webster’s Revised Unabridged Dictionary · 1913
Archipterygium
Ar·chip′te·ryg′i·um (är·kĭp′tē·rĭj′ĭ·ŭm), n. [NL., fr. Gr. pref. ἀρχι- (E. arch-) + πτερύγιον wing, fin.] (Anat.) The primitive form of fin, like that of Ceratodus.
Webster’s Revised Unabridged Dictionary · 1913
Ar·chip′te·ryg′i·um (är·kĭp′tē·rĭj′ĭ·ŭm), n. [NL., fr. Gr. pref. ἀρχι- (E. arch-) + πτερύγιον wing, fin.] (Anat.) The primitive form of fin, like that of Ceratodus.