Drainage basin: The area drained by a river and its tributaries. A drainage basin is considered to be an open system because water can be added or lost from a drainage basin.
Noun. 1. milk whey-the serum or watery part of milk that is separated from the curd in making cheese. whey. blood serum, serum-an amber, watery fluid, rich in proteins, that separates out when blood coagulates. 1  Facebook. 2  Twitter.
Whey protein is a milk protein that is the liquid by-product of cheese production. In supplement form, whey protein comes in three main forms: 1  Whey Protein Concentrate: Contains some fat and lactose and between 29% - 89% protein depending on the specific product. 2  Whey protein concentrates often have more bioactive compounds.