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Noun mesozoic era has 1 sense
  1. Mesozoic, Mesozoic era, Age of Reptiles - from 230 million to 63 million years ago
    --1 is a kind of era, geological era
    --1 has parts:
     Cretaceous, Cretaceous period; Jurassic, Jurassic period; Triassic, Triassic period
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