/ Dictionary / Index M microtherm: Meaning and Definition of Find definitions for: mi•cro•therm Pronunciation: (mī'kru-thûrm"), [key] — n. a plant requiring a minimum of heat for growth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. microtektite microthin Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language