: the watery part of milk that is separated from the coagulable part or curd especially in the process of making cheese and that is rich in lactose, minerals, and vitamins and contains lactalbumin and traces of fat
wheylike adjective

Examples of whey in a Sentence

The curd has separated from the whey.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Then environmental regulation limited whey dumping, and technological developments made processing whey into powder much easier. Ellen Cushing, The Atlantic, 15 May 2026 Protein supplements, like whey protein powder, are good options as well, but the amount of protein will vary based on brand and scoop size. Malissa Rodenburg, Health, 15 May 2026 The straining process removes the liquid, lower-protein whey, and you're left with a thicker dairy product loaded with protein. Olivia Tarantino, Martha Stewart, 26 Apr. 2026 Then the whey is packed, shaped, and aged in caves like Batman’s Robin’s. Brian Moylan, Vulture, 24 Apr. 2026 See All Example Sentences for whey

Word History

Etymology

Middle English, from Old English hwæg; akin to Middle Dutch wey whey

First Known Use

before the 12th century, in the meaning defined above

Time Traveler
The first known use of whey was before the 12th century

Browse Nearby Words

Cite this Entry

“Whey.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/whey. Accessed 22 May. 2026.

Kids Definition

whey

noun
ˈhwā How to pronounce whey (audio)
ˈwā
: the watery part of milk that separates after the milk has soured and thickened especially in the process of making cheese compare curd sense 1

Medical Definition

whey

noun
: the serum or watery part of milk that is separated from the coagulable part or curd especially in the process of making cheese and that is rich in lactose, minerals, and vitamins and contains lactalbumin and traces of fat

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