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.

< Neo-Latin Arthrodira, equivalent to arthro- arthro- + -dira < Greek deirḗ neck, throat

arthrodiran [ahr-thruh-dahy-ruhn] , arthrodirous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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