or al·lot·ro·pism

noun Chemistry.
  1. a property of certain elements, as carbon, sulfur, and phosphorus, of existing in two or more distinct forms; allomorphism.

Origin of allotropy

First recorded in 1840–50; allo- + -tropy Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for allotropism

Historical Examples of allotropism

British Dictionary definitions for allotropism



  1. the existence of an element in two or more physical forms. The most common elements having this property are carbon, sulphur, and phosphorus
Derived Formsallotropic (ˌæləˈtrɒpɪk), adjectiveallotropically, adverb
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

allotropism in Medicine


  1. The existence of two or more forms of an element that differ from one another in crystalline or molecular structure.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.