Le·the
noun/ˈliːθi/
/ˈliːθi/
[uncountable]- (in ancient Greek stories) an imaginary river whose water, when drunk, was thought to make the dead forget their life on Earth
勒忒，忘川（假想的河流，死者饮此河的水即忘记尘世一生） Word Originvia Latin from Greek lēthē ‘forgetfulness’, from the base of lanthanesthai ‘forget’.