- Gr. Myth. a daughter of Uranus and wife of Oceanus, by whom she is the mother of the Oceanides
- a satellite of Saturn having long trenchlike valleys and sharing its orbit with other satellites
Origin: L from Glassical Greek Tēthys
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- Greek Mythology A Titaness and sea goddess who was both sister and wife of Oceanus.
- A satellite of Saturn.
Origin: Latin Tēthys, from Greek Tēthus.