Try Our Apps


Avoid these words. Seriously.


[al-uh-trohp] /ˈæl əˌtroʊp/
noun, Chemistry.
one of two or more existing forms of an element:
Graphite and diamond are allotropes of carbon.
Origin of allotrope
First recorded in 1885-90; allo- + -trope Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
British Dictionary definitions for allotrope


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
Cite This Source
Word Origin and History for allotrope

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
Cite This Source
allotrope 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.
Cite This Source
allotrope 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.
Cite This Source

Word of the Day

Nearby words for allotrope

Difficulty index for allotrope

Few English speakers likely know this word

Word Value for allotrope

Scrabble Words With Friends