/ Dictionary / Index M merisis: Meaning and Definition of Find definitions for: mer•i•sis Pronunciation: (mer'u-sis), [key] — n. Biol. growth, esp. growth resulting from cell division. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Merionethshire meristem 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