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[al-uh-trohp] /ˈæl əˌtroʊp/
noun, Chemistry
one of two or more existing forms of an element:
Graphite and diamond are allotropes of carbon.
1885-90; allo- + -trope Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for allotropes
  • First, one must distinguish between allotropes and polymorphs.
  • Cobalt tends to exist as a mixture of two allotropes over a wide temperature range.
  • Elemental phosphorus is made commercially in several different forms called allotropes.
  • Yellow and white phosphorus, both allotropes of elemental phosphorus, are hazardous chemicals that spontaneously ignite in air.
British Dictionary definitions for allotropes


any of two or more physical forms in which an element can exist: diamond and graphite are allotropes of carbon
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
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Word Origin and History for allotropes



1847, back-formation from allotropy "variation of physical properties without change of substance," from allo- + -tropy "manner" (see -trope). Related: Allotropic.

Online Etymology Dictionary, © 2010 Douglas Harper
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allotropes in Medicine

allotrope al·lo·trope (āl'ə-trōp')
A structurally differentiated form of an element that exhibits allotropism.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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allotropes in Science
Any of several crystalline forms of a chemical element. Charcoal, graphite, and diamond are all allotropes of carbon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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