buttermilk

from WordNet (r) 3.0 (2006)
buttermilk
    n 1: residue from making butter from sour raw milk; or
         pasteurized milk curdled by adding a culture
from The Collaborative International Dictionary of English v.0.48
Buttermilk \But"ter*milk`\, n.
   The milk that remains after the butter is separated from the
   cream.
   [1913 Webster]
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