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Meaning of idiomorphic

id•i•o•mor•phic

Pronunciation: (id"ē-u-môr'fik), [key]
— adj.
  1. (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.
  2. having its own characteristic form.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.