/ Dictionary / Index A achromatous: Meaning and Definition of Find definitions for: a•chro•ma•tous Pronunciation: (ā-krō'mu-tus), [key] — adj. without color. having little or inadequate color; lighter in color than normal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: achromatous (Thesaurus) achromatopsia achromic Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language