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
Carbon nanotubes are molecular-scale tubes usually made of a carbon allotrope.
Moving to polytopes or allotrope seem to have values in science?
Buckminister Fuller and Richard Smalley in terms of allotrope.
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.
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."
Peter from Aston Rowant e-mails in on that allotrope business.
White phosphorus (WP) is a flare - and smoke-producing incendiary device  or smoke-screening agent that is made from a common allotrope of the chemical element phosphorus.
Carbon nanotubes (aka: "buckytubes") are an allotrope of a carbon molecule which have cylindrical nanostructures.