/ Dictionary / Index A anorthite: Meaning and Definition of Find definitions for: an•or•thite Pronunciation: (an-ôr'thīt), [key] — n. Mineral. a white or gray feldspar mineral, CaAlSiO, calcic plagioclase. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: anorthite (Thesaurus) anorgasmia anorthoclase Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language