Definition of whey noun from the Oxford Advanced Learner's Dictionary

 

whey

 noun
noun
BrE BrE//weɪ//
 
; NAmE NAmE//weɪ//
 
[uncountable]
 
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the thin liquid that is left from sour milk after the solid part (called curds ) has been removed Word Origin Old English hwæg, hweg, of Germanic origin; related to Dutch wei.
See the Oxford Advanced American Dictionary entry: whey