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 the term used to describe a group of milk proteins that are isolated from whey, which is the left over product of milk after it is coagulated during the cheese making process. Most people think that whey protein is just the typical amino acids we know about but contains a lot of other molecules.