From The Collaborative International Dictionary of English v.0.48:

Whey \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

   Note: In this process, the thick part is called curd, and
         the thin part whey.
         [1913 Webster]
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