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