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Webster's 1828 Dictionary

ACANTHOPTERYGIOUS

a.[Gr. a thorn, and a little feather, from a feather. ] In zoology, having back fins which are hard, bony and pricky, a term applied to certain fishes.

 

Webster's 1913 Dictionary

ACANTHOPTERYGIOUS

ACANTHOPTERYGIOUS Ac `an *thop `ter *yg "i *ous, a. (Zoöl.)

 

Defn: Having fins in which the rays are hard and spinelike; spiny- finned.