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

allotrope

noun
 
/ˈælətrəʊp/
 
/ˈælətrəʊp/
(chemistry)
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  1. one of the different forms in which a chemical element exists. For example, diamond and graphite are allotropes of carbon.
    Word Originlate 19th cent.: back-formation from allotropy.
See allotrope in the Oxford Advanced American Dictionary
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