• synonyms


  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.
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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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for idiomorphic

Historical Examples

  • Idiomorphic, id-i-o-mor′fik, adj. having a peculiar or distinctive form.

    Chambers's Twentieth Century Dictionary (part 2 of 4: E-M)


  • Typical nepheline-dolerites are scarce, and consist of idiomorphic augite, surrounded by nepheline.

British Dictionary definitions for idiomorphic


  1. (of minerals) occurring naturally in the form of well-developed crystals
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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