Te·​thys ˈtē-thəs How to pronounce Tethys (audio)
: a Titaness and wife of Oceanus

Word History


Latin, from Greek Tēthys

First Known Use

1567, in the meaning defined above

Time Traveler
The first known use of Tethys was in 1567

Dictionary Entries Near Tethys

Cite this Entry

“Tethys.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Tethys. Accessed 6 Feb. 2023.

Geographical Definition


geographical name

Te·​thys ˈtē-thəs How to pronounce Tethys (audio)
either of two ancient seas: an earlier one that extended into eastern Pangaea late in the Paleozoic Era, or a later one that separated Laurasia to the north from Gondwana to the south during the Mesozoic Era

Note: The Mediterranean, Black, Caspian, and Aral seas are remnants of the later Tethys Sea.

Tethyan adjective
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?