— arthrodiran /ahr'threuh duy"reuhn/ , arthrodirous , adj.
/ahr"threuh duyeur'/ , n.
any of numerous fishes of the extinct order Arthrodira, widely distributed during the Devonian Period, having the anterior part of the body covered by a shield of bony plates.
[ Arthrodira, equiv. to arthro- ARTHRO- + -dira deiré neck, throat ]