One of the mysteries of the English language finally explained.
Treated as plural. A class (or subclass) of bony fishes comprising the ray-finned fishes, characterized by having hard and spiny rays in the dorsal fins.
Mid 18th century; earliest use found in John Hill (bap. 1714, d. 1775), physician and actor. From post-classical Latin Acanthopterygii, plural noun (P. Artedi Ichthyologia 86) from acantho- + -pterygii.
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