One of the mysteries of the English language finally explained.
Belonging to the class (or subclass) Acanthopterygii of ray-finned fishes; designating or relating to these fishes.
A fish of the class (or subclass) Acanthopterygii.
Mid 19th century. From acantho- + -pterygian, after scientific Latin Acanthopterygii Acanthopterygii.
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