1. Also euhedral. (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.

Origin of idiomorphic

1885–90; < Greek idiómorph(os) having an individual form (see idio-, -morphous) + -ic
Related formsid·i·o·mor·phi·cal·ly, adverbid·i·o·mor·phism, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for idiomorphic

Historical Examples of idiomorphic

British Dictionary definitions for idiomorphic


  1. (of minerals) occurring naturally in the form of well-developed crystals
Derived Formsidiomorphically, adverbidiomorphism, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012