Definition of Tethys in US English:


proper noun

  • 1Greek Mythology
    A goddess of the sea, daughter of Uranus (Heaven) and Gaia (Earth).

  • 2Astronomy
    A satellite of Saturn, the ninth closest to the planet, discovered by Cassini in 1684. It is probably composed mainly of ice and has a diameter of 659 miles (1,060 km).

  • 3Geology
    An ocean formerly separating the supercontinents of Gondwana and Laurasia, the forerunner of the present-day Mediterranean.