noun Chemistry.
a property of certain elements, as carbon, sulfur, and phosphorus, of existing in two or more distinct forms; allomorphism.
Also, allotropism.

1840–50; allo- + -tropy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
allotropy or allotropism (əˈlɒtrəpɪ)
the existence of an element in two or more physical forms. The most common elements having this property are carbon, sulphur, and phosphorus
allotropism or allotropism
allotropic or allotropism
allo'tropically or allotropism

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences for allotropy
For pure chemical elements, polymorphism is known as allotropy.
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