Hypertext Webster Gateway: "buttermilk"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Buttermilk \But"ter*milk`\, n.
The milk that remains after the butter is separated from the
cream.
From WordNet (r) 1.7 (wn)
buttermilk
n : residue from making butter from sour raw milk; or
pasteurized milk curdled by adding a culture
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