butterfat

noun

Etymology: Etymology tree English butter English fat English butterfat From butter + fat.

1. The fatty components of milk and other dairy products.

   “The first change which milk undergoes in the stomach is coagulation. The casein and butterfat separates from the serum, which is soon absorbed unchanged into the blood, according to the laws of diffusion. [Quoting Wagner's Manual of Physiology.]”

   “By submitting pure solid butter-fat to powerful pressure in a linen cloth at the temperature of 60°, a slightly yellow transparent oil will flow out, and a solid white fat will remain behind; the first is called oleine or butter-oil, and the second margarine; and of these two substances the pure fat of butter almost entirely consists, although, as may be supposed, their relative proportions are liable to great variations.”