/ Dictionary / Index M mesophyll: Meaning and Definition of Find definitions for: mes•o•phyll Pronunciation: (mez'u-fil, mes'-, mē'zu-, -su-), [key] — n. Bot. the parenchyma, usually containing chlorophyll, that forms the interior parts of a leaf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mesophilic mesophyte 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