/ Dictionary / Index M methemoglobin: Meaning and Definition of Find definitions for: met•he•mo•glo•bin Pronunciation: (met-hē'mu-glō"bin, -hem'u-, -hē"mu-glō'-, -hem"u-), [key] — n. Biochem. a brownish compound of oxygen and hemoglobin, formed in the blood, as by the use of certain drugs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. metheglin methenamine Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language