buttermilk

noun

1. (countable, uncountable)The liquid left over after producing butter from full cream milk by the churning process, also called traditional buttermilk.

   “An anti-aphrodisiac, suggested in Hindu erotological literature as a way for women to negate amatory challenges, is to bathe in the buttermilk of a she-buffalo.”

2. (countable, uncountable)Cultured buttermilk, a fermented dairy product produced from cow's milk, with a characteristically sour taste.
3. (countable, uncountable)A light yellow color, like that of buttermilk.