GNU Collaborative International Dictionary of English

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1.       
   Whey , n. [AS. hwæg; 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. In this process, the thick part is called curd, and the thin part whey.
   1913 Webster