lethe

noun

le·​the ˈlē-thē How to pronounce lethe (audio)
1
Lethe : a river in Hades whose waters cause drinkers to forget their past
2
lethean adjective
often Lethean

Word History

Etymology

borrowed from Latin Lēthē, locale or a river in the Underworld, borrowed from Greek lḗthē "forgetfulness, oblivion" (personified as a goddess of forgetfulness, also a plain in the Underworld), derivative from the base of lanthánein "to escape one's notice," lanthánesthai "to forget" — more at latent

First Known Use

14th century, in the meaning defined at sense 1

Time Traveler
The first known use of lethe was in the 14th century

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Cite this Entry

“Lethe.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lethe. Accessed 5 Nov. 2025.

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