Nepenthe

nepenthe \ni-PEN-thee\, noun:

1. 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, esp. of sorrow or trouble.

Nepenthe is comprised of the Greek roots ne-, "not," and penthos, "grief."