butter; milk fat; a mixture of glycerides, mainly butyrin, olein, and palmitin.

1885–90; butter + fat

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World English Dictionary
butterfat (ˈbʌtəˌfæt)
the fatty substance of milk from which butter is made, consisting of a mixture of glycerides, mainly butyrin, olein, and palmitin

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Encyclopedia Britannica


natural fatty constituent of cows' milk and the chief component of butter. Clear butterfat rises to the top of melted butter and may be poured off, leaving the albuminous curd and water that favour the growth of organisms promoting rancidity; thus, anhydrous butterfat does not become rancid as readily as butter and can be stored unrefrigerated for several months. Butterfat is used in cooking and as a component in special dishes

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
It's an indulgence that will, one hopes, never be banned despite concerns about
Due to the small population of the lower butterfat milk samples, comparisons of
  results by butterfat content is limited.
We strive for a high quality milk, rich in butterfat and protein.
Blend prices pertain to a specified butterfat content and location within an
  order area.
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