/ Dictionary / Index M microcline: Meaning and Definition of Find definitions for: mi•cro•cline Pronunciation: (mī'kru-klīn"), [key] — n. a mineral of the feldspar group, potassium aluminum silicate, KAlSiO, identical in composition with orthoclase but having triclinic instead of monoclinic crystals, used in making porcelain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. microclimatology micrococcus Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language