/ Dictionary / Index A achroite: Meaning and Definition of Find definitions for: ach•ro•ite Pronunciation: (ak'rō-īt"), [key] — n. the colorless or white variety of tourmaline, often used as a gem. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. achoo achromat Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language