Etymology
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allotrope (n.)

1847, back-formation from allotropy "variation of physical properties without change of substance," from Greek allotropos "in another manner;" see allo- "different" + -trope "way, manner." Diamond is an allotrope of carbon. Related: Allotropic.

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Definitions of allotrope

allotrope (n.)
a structurally different form of an element;
graphite and diamond are allotropes of carbon
From wordnet.princeton.edu