Thetis

noun
The·tis | \ˈthē-təs \

Definition of Thetis 

: a sea goddess who marries Peleus and becomes the mother of Achilles

First Known Use of Thetis

14th century, in the meaning defined above

History and Etymology for Thetis

Latin, from Greek

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The first known use of Thetis was in the 14th century

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