WordNet Dictionary- [n] watery part of milk produced when raw milk sours and coagulates; "Little Miss Muffet sat on a tuffet eating some curds and whey"
- [n] the serum or watery part of milk that is separated from the curd in making cheese
Webster's 1913 Dictionary\Whey\, n. [AS. hw[ae]g; cf. D. wei, hui, Fries. weye, LG.
wey, waje. ]
The serum, or watery part, of milk, separated from the more
thick or coagulable part, esp. in the process of making
cheese.
Note: In this process, the thick part is called {curd}, and
the thin part whey.
Biology Dictionary