a drug or drink, or the plant yielding it, mentioned by ancient writers as having the power to bring forgetfulness of sorrow or trouble.
2.
anything inducing a pleasurable sensation of forgetfulness, especially of sorrow or trouble.
Origin: 1590–1600; < Latin nēpenthes < Greek nēpenthés herb for soothing, noun use of neuter of nēpenthḗs sorrowless, equivalent to nē- not + pénth(os) sorrow + -ēs adj. suffix
1580, nepenthes, from Gk., from ne- "no, not" (see un-) + penthos "grief" (related to pathos). A drug of Egypt mentioned in the "Odyssey" as capable of banishing grief or trouble from the mind. The -s is a proper part of the word, but was likely mistaken in Eng. as a plural affix and dropped.