/ Dictionary / Index I idiochromatic: Meaning and Definition of Find definitions for: id•i•o•chro•mat•ic Pronunciation: (id"ē-u-krō-mat'ik, -ō-kru-), [key] — adj. (of a mineral) deriving a characteristic color from its capacity to absorb certain light rays. Cf. allochromatic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. idioblast idiocrasy Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language