Definition of allotrope noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈælətrəʊp//
; NAmE NAmE//ˈælətroʊp//
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one of the different forms in which a chemical element exists. For example, diamond and graphite are allotropes of carbon. Word Origin late 19th cent.: back-formation from allotropy.
See the Oxford Advanced American Dictionary entry: allotrope