Noun lethe has 1 sense
  1. Lethe, River Lethe - (Greek mythology) a river in Hades; the souls of the dead had to drink from it, which made them forget all they had done and suffered when they were alive
    --1 is a kind of river
    --1 is a part of
     Hel, Hell, Hades, infernal region, netherworld, Scheol, underworld
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