/ Dictionary / Index A acanthopterygian: Meaning and Definition of Find definitions for: ac•an•thop•ter•yg•i•an Pronunciation: (ak"un-thop"tu-rij'ē-un), [key] — adj. belonging or pertaining to the Acanthopterygii (Acanthopteri), the group of spiny-finned fishes, including the bass and perch. —n. an acanthopterygian fish. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: acanthopterygian (Thesaurus) acanthology acanthous Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language