/ Dictionary / Index M M.N.A.S.: Meaning and Definition of Find definitions for: M.N.A.S. Pronunciation: [key] Member of the National Academy of Sciences. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. M'Naghten test M.N.E. Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language