Etymology
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buttermilk (n.)

1520s, from butter (n.) + milk (n.). Compare German Buttermilch, Dutch botermelk. It is what remains after the butter has been churned out.

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Definitions of buttermilk

buttermilk (n.)
residue from making butter from sour raw milk; or pasteurized milk curdled by adding a culture;
From wordnet.princeton.edu