Etymology
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whey (n.)

Old English hwæg "whey," from Proto-Germanic *hwaja- (source also of Middle Dutch wey, Dutch wei), of unknown origin.

updated on March 27, 2014

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Definitions of whey from WordNet

whey (n.)
the serum or watery part of milk that is separated from the curd in making cheese;
Synonyms: milk whey
whey (n.)
watery part of milk produced when raw milk sours and coagulates;
Little Miss Muffet sat on a tuffet eating some curds and whey
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.