whey

noun

1. the serum or watery part of milk that is separated from the curd in making cheese

   noun.substance

   Synonyms milk whey

   Source: WordNet 3.0

2. watery part of milk produced when raw milk sours and coagulates

   noun.food

   Examples

   Little Miss Muffet sat on a tuffet eating some curds and whey.

   Source: WordNet 3.0

3. The serum, or watery part, of milk, separated from the more thick or coagulable part, esp. in the process of making cheese.

   noun

   Source: webster1913