This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The sour liquid that remains after the butterfat has been removed from whole milk or cream by churning.

n. A cultured sour milk made by adding certain microorganisms to sweet milk.

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

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

n. The milk that remains after the butter is separated from the cream.

n. The liquid that remains after the butter is separated from milk. It has a pleasant acidulous taste. Also called churn-milk.

n. residue from making butter from sour raw milk; or pasteurized milk curdled by adding a culture

"The thing about the buttermilk is that it really tenderises the chicken."

milk   

yoghurt    milk    whey    curd   

oatmeal    lemonade    molasses    hominy    curd    treacle    seasoning    gruel    currant    cocoa