buttermilk

/หˆbสŒtษ™หŒmษชlk/
noun
  1. 1

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

  2. 2

    Cultured buttermilk, a fermented dairy product produced from cow's milk, with a characteristically sour taste.

Source: https://en.wiktionary.org/wiki/buttermilk