/ Dictionary / Index A acantho-: Meaning and Definition of Find definitions for: acantho- Pronunciation: [key] a combining form from Greek meaning “spine,” used in the formation of compound words: acanthocephalan. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acanthite acanthocephalan Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language