WHEY

whey

(noun) watery part of milk produced when raw milk sours and coagulates; “Little Miss Muffet sat on a tuffet eating some curds and whey”

whey, milk whey

(noun) the serum or watery part of milk that is separated from the curd in making cheese

Source: WordNet® 3.1

Etymology

Noun

whey (usually uncountable, plural wheys)

The liquid remaining after milk has been curdled and strained in the process of making cheese.

Source: Wiktionary

Whey, n. Etym: [AS. hwæg; cf. D. wei, hui, Fries. weye, LG. wey, waje. ]

Definition: The serum, or watery part, of milk, separated from the more thick or coagulable part, esp. in the process of making cheese. In this process, the thick part is called curd, and the thin part whey.

Source: Webster’s Unabridged Dictionary 1913 Edition