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  1. allotrope

    • IPA[ˈalətrəʊp]

    英式

    • n.
      each of two or more different physical forms in which an element can exist. Graphite, charcoal, and diamond are all allotropes of carbon.
    • noun: allotrope, plural noun: allotropes

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    • IPA[ˈaləˌtrōp]

    美式

    • n.
      each of two or more different physical forms in which an element can exist. Graphite, charcoal, ...

    Oxford American Dictionary