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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World English Dictionary
allotrope (ˈæləˌtrəʊp)
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 10th Edition
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Word Origin & History

from allotropy "variation of physical properties without change of substance," from allo-, comb. form of Gk. allos "other, different" + tropos "manner" (see trope).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
allotrope   (āl'ə-trōp')  Pronunciation Key 
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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Example sentences
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.
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