[hwey, wey]
a milk serum, separating as liquid from the curd after coagulation, as in cheese making.

before 900; Middle English wheye, Old English hwǣg; cognate with Dutch, Low German wei

wheylike, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
whey (weɪ)
the watery liquid that separates from the curd when the milk is clotted, as in making cheese
[Old English hwǣg; related to Middle Low German wei, heie, Dutch hui]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. hwæg "whey," from P.Gmc. *khwaja- (cf. M.Du. wey, Du. wei), of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


watery fraction that forms along with curd when milk coagulates. It contains the water-soluble constituents of milk and is essentially a 5 percent solution of lactose in water, with some minerals and lactalbumin.

Learn more about whey with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Whey they do, it is certainly the beginning of the end.
Now all the vessels swam with whey, the milk-pails and the bowls, the
  well-wrought vessels whereinto he milked.
If mixture is too thick to stir, add another tablespoon of whey.
The leftover whey should no longer look white, and is full of protein.
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