Tethys
noun
Te·thys ˈtē-thəs 
: a Titaness and wife of Oceanus
Word History
Etymology
Latin, from Greek Tēthys
First Known Use
1567, in the meaning defined above
Geographical Definition
Tethys
geographical name
Te·thys ˈtē-thəs
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
ˈtē-thē-ən
adjective