/ Dictionary / Index M metagnathous: Meaning and Definition of Find definitions for: me•tag•na•thous Pronunciation: (mu-tag'nu-thus), [key] — adj. having the tips of the mandibles crossed, as the crossbills. having biting mouthparts in the larval stage and sucking mouthparts in the adult stage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. metagenesis metal Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language