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  1. superheavy

    • IPA[ˌso͞opərˈhevē]

    美式

    • adj.
      relating to or denoting an element with an atomic mass or atomic number greater than those of the naturally occurring elements, especially one belonging to a group above atomic number 110 having proton/neutron ratios which in theory confer relatively long half-lives.
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    • IPA[ˌsuːpəˈhɛvi]

    英式

    • adj.
      relating to or denoting an element with an atomic mass or atomic number greater than those of ...

    Oxford Dictionary