/ Dictionary / Index A acanthous: Meaning and Definition of Find definitions for: a•can•thous Pronunciation: (u-kan'thus), [key] — adj. spinous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: acanthous (Thesaurus) acanthopterygian acanthus 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