from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A structurally differentiated form of an element that exhibits allotropy.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any form of an element that has a distinctly different molecular structure to another form of the same element.

from The Century Dictionary and Cyclopedia

  • n. One of the forms in which an element having the property of allotropy exists: thus, the diamond is an allotrope of carbon.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a structurally different form of an element


Back-formation from allotropy.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Ancient Greek ἄλλος (allos, "other"), and τρόπος (tropos, "way, manner"). (Wiktionary)


  • Carbon nanotubes are molecular-scale tubes usually made of a carbon allotrope.

    Original Signal - Transmitting Gadgets

  • Moving to polytopes or allotrope seem to have values in science?

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  • Buckminister Fuller and Richard Smalley in terms of allotrope.

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  • A new fifth allotrope of carbon was recently produced, a spongy solid called a magnetic carbon “nanofoam” that is extremely lightweight and attracted to magnets.


  • What happens is that at a certain height in the Jovian atmosphere, the pressure allows a red crystalline form of ice-not the white stuff we splash whisky onto, or the black allotrope down at the surface, or the super-dense variety in the mantle around the Jovian core.

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  • Take all this stuff, for instance; especially their ability to transform iron into a fluid allotrope, and in that form to use its intra-atomic energy as power.


  • Edward, TMS inbox: "0312 Isotope is not the word you're looking for - you are thinking of allotrope."

    BBC News - Home

  • Peter from Aston Rowant e-mails in on that allotrope business.

    BBC News - Home

  • White phosphorus (WP) is a flare - and smoke-producing incendiary device [1] or smoke-screening agent that is made from a common allotrope of the chemical element phosphorus. - Articles related to Israel is spying because it can't wage war - top Hizbullah MP

  • Carbon nanotubes (aka: "buckytubes") are an allotrope of a carbon molecule which have cylindrical nanostructures.



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