/ Dictionary / Index B biotite: Meaning and Definition of Find definitions for: bi•o•tite Pronunciation: (bī'u-tīt"), [key] — n. a very common mineral of the mica group, occurring in black, dark-brown, or dark-green sheets and flakes: an important constituent of igneous and metamorphic rocks. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: biotite (Thesaurus) biotin biotope Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language