/ Dictionary / Index I idiomorphic: Meaning and Definition of Find definitions for: id•i•o•mor•phic Pronunciation: (id"ē-u-môr'fik), [key] — adj. (in a rock) noting or pertaining to a mineral constituent having its own characteristic outward crystalline form unaltered by the other constituents of the rock; automorphic. having its own characteristic form. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. idiomatic -idion Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language