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 is a cheese byproduct. When you add an enzyme to milk to make cheese, then remove the curds that form, the remaining liquid is whey. Kraft spokesman David Roycraft says that the whey and water are needed for consistency.