allotrope

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Definitions from WordNet

Noun allotrope has 1 sense

allotrope - a structurally different form of an element; "graphite and diamond are allotropes of carbon"
--₁ is a kind of chemical element, element

Definitions from the Web

Allotrope

Noun: An allotrope refers to each of the two or more different physical forms in which an element can exist.

Example sentence: Carbon has several allotropes, including graphite and diamond.

Noun: In chemistry, an allotrope denotes each of the different structural forms of a molecule.

Example sentence: Oxygen exists as a diatomic molecule in its most stable allotrope.