/ Dictionary / Index M mesophilic: Meaning and Definition of Find definitions for: mes•o•phil•ic Pronunciation: (mez"u-fil'ik, mes"-, mē"zu-, -su-), [key] — adj. (of bacteria) growing best at moderate temperatures, between 25°C and 40°C. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mesophile mesophyll Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language