What does the word whey mean?

Usage examples for whey

  1. There should be no aim to make whey butter. – The American Reformed Cattle Doctor by George Dadd
  2. In making, the curds are set on a straw mat in molds, for the whey to run away. – The Complete Book of Cheese by Robert Carlton Brown
  3. You are a diamond dealer, Laadham, bud you don'd know much aboud dem from whey dey come at. – The Diamond Master by Jacques Futrelle