/ Dictionary / Index M metalline: Meaning and Definition of Find definitions for: met•al•line Pronunciation: (met'l-in, -īn"), [key] — adj. metallic. containing one or more metals or metallic salts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. metalliferous metallist 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