Etymology
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allotropy (n.)

in chemistry, "property of existing in two or more distinct forms, variation of physical properties without change of substance," 1850, from French or German allotropie (1840), from Greek allotropia "variety," from allos "different, other" (from PIE root *al- (1) "beyond") + tropos "manner, way" (from PIE root *trep- "to turn").

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Definitions of allotropy

allotropy (n.)
the phenomenon of an element existing in two or more physical forms;
Synonyms: allotropism
From wordnet.princeton.edu