/ Dictionary / Index M metallo-: Meaning and Definition of Find definitions for: metallo- Pronunciation: [key] a combining form representingin compound words: metallography. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. metallize metallocene Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language