/ Dictionary / Index M mesozoan: Meaning and Definition of Find definitions for: mes•o•zo•an Pronunciation: (mez"u-zō'un, mes"-, mē"zu-, -su-), [key] — Zool. Zool. —n. any member of the phylum Mesozoa. —adj. of or pertaining to the mesozoans. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mesozoa Mesozoic Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language