/ Dictionary / Index M microcapsule: Meaning and Definition of Find definitions for: mi•cro•cap•sule Pronunciation: (mī'krō-kap"sul, -sl, -syl), [key] — n. Chem. a tiny capsule, 20–150 microns in diameter, used for slow-release application of drugs, pesticides, flavors, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. microbus microcassette Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language