Etymology
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Thetis

name of a sea goddess in Greek mythology, mother of Achilles by Peleus. Since Roman times, sometimes, in poetry, "the sea personified."

updated on October 10, 2017

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Definitions of Thetis from WordNet

Thetis (n.)
(Greek mythology) one of the 50 Nereids; mother of Achilles by Peleus;
From wordnet.princeton.edu, not affiliated with etymonline.