/ Dictionary / Index M microchemistry: Meaning and Definition of Find definitions for: mi•cro•chem•is•try Pronunciation: (mī"krō-kem'u-strē), [key] — n. the branch of chemistry dealing with minute quantities of substances. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. microcephalic microchip Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language