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.
After the curds are formed, the remaining liquid is called whey; it is typically thin and watery and will sometimes have a bluish tinge, but this depends on the quality and type of milk used. Whey can be made from any type of milk â cow's milk is the most popular in the United States.