/ Dictionary / Index M micronutrient: Meaning and Definition of Find definitions for: mi•cro•nu•tri•ent Pronunciation: (mī"krō-n'trē-unt, -ny'-), [key] — n. Biochem. an essential nutrient, as a trace mineral or vitamin, that is required by an organism in minute amounts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: micronutrient (Thesaurus) micronucleus microorganism Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language