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Webster 1913 Edition
Buttermilk
But′ter-milkˊ
,Noun.
 The milk that remains after the butter is separated from the cream. 
Definition 2025
buttermilk
buttermilk
English
Noun
buttermilk (countable and uncountable, plural buttermilks)
- The liquid left over after producing butter from full cream milk by the churning process, also called traditional buttermilk.
 - Cultured buttermilk, a fermented dairy product produced from cow's milk, with a characteristically sour taste.
 
Translations
traditional buttermilk
  | 
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cultured buttermilk