One of the mysteries of the English language finally explained.
A member of the extinct order Arthrodira of placoderm fishes, which are known from Devonian fossil deposits and have a bony head-shield that is articulated at the neck to another bony shield covering the upper part of the body.
Late 19th century; earliest use found in American Naturalist. From scientific Latin Arthrodira, order name from ancient Greek ἄρθρον joint + δειρή (Attic δέρη) neck.
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