from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Greek Mythology A Titaness and sea goddess who was both sister and wife of Oceanus.
- n. The satellite of Saturn that is eighth in distance from the planet.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. Personification of fertile waters, she was a Titan daughter of Uranus and Gaia, and with her brother Oceanus gave birth to all rivers and the Oceanids.
- proper n. A large ocean which formerly lay between Eurasia and Africa.
- proper n. A moon of Saturn.
from the GNU version of the Collaborative International Dictionary of English
- n. A genus of a large naked mollusks having a very large, broad, fringed cephalic disk, and branched dorsal gills. Some of the species become a foot long and are brilliantly colored.
from The Century Dictionary and Cyclopedia
- n. A genus of nudibranchiates, typical of the family Tethyidæ.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. type genus of the family Aplysiidae
- n. (Greek mythology) a Titaness and sea goddess; wife of Oceanus
Latin Tēthys, from Greek Tēthus.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek Τηθύς. (Wiktionary)