libation
Concise Oxford English Dictionary © 2008 Oxford University Press:
libation /lʌɪˈbeɪʃ(ə)n/
▶noun
- 1 the pouring out of a drink as an offering to a deity.
■ such a drink.
- 2 humorous an alcoholic drink.
– origin ME: from L. libatio(n-), from libare ‘pour as an offering’.
'libation' also found in these Oxford entries:

