Arthrodira

plural noun
Ar·​thro·​di·​ra

Definition of Arthrodira 

: a group of Devonian fishes forming a subclass of Placodermi or especially formerly an order of Ostracodermi or a separate class and having the forepart of the body protected by bony plates and with an imperfectly ossified internal skeleton — see coccosteidae , dinichthys

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Other Words from Arthrodira

arthrodiran \ ¦⸗⸗¦dīrən \ adjective or noun
arthrodire \ ˈ⸗⸗ˌdī(ə)r \ noun plural -s
arthrodirous \ -​¦dīrəs \ adjective

First Known Use of Arthrodira

1891, in the meaning defined above

History and Etymology for Arthrodira

New Latin, from arthr- + -dira (from Greek deirē neck); akin to Latvian grīva mouth of a river, Old Slavic griva mane, Sanskrit grīva neck, Latin vorare to devour

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The first known use of Arthrodira was in 1891

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