/ Dictionary / Index A alco-: Meaning and Definition of Find definitions for: alco- Pronunciation: [key] a combining form representingin compound words (alcogas), sometimes with the sense “using alcohol as fuel” (alcoboat; alcotruck). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Alcmene alcohol Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language