/ Dictionary / Index M microspore: Meaning and Definition of Find definitions for: mi•cro•spore Pronunciation: (mī'kru-spôr", -spōr"), [key] — n. Bot. the smaller of the two kinds of spores characteristically produced by seed plants and some fern allies, developing into a male gametophyte. Cf. a pollen grain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: microspore (Thesaurus) microsporangium microsporocyte Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language