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Tethys

noun

  1. Gr. Myth. a daughter of Uranus and wife of Oceanus, by whom she is the mother of the Oceanides
  2. a satellite of Saturn having long trenchlike valleys and sharing its orbit with other satellites

an ancient sea and geosyncline, especially of the Mesozoic and early Cenozoic eras that separated Laurasia from Gondwana

See Tethys in American Heritage Dictionary 4

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