/ Dictionary / Index M microstructure: Meaning and Definition of Find definitions for: mi•cro•struc•ture Pronunciation: (mī'krō-struk"chur), [key] — n. Metall. the structure of a metal or alloy as observed, after etching and polishing, under a high degree of magnification. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. microstress microsurgery Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language