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.
Milk is made of two proteins, casein and whey. Whey protein can be separated from the casein in milk or formed as a by-product of cheese making.Whey protein is considered a complete protein and contains all 9 essential amino acids and is low in lactose content. WPI is usually at least 90% protein. 2  Whey protein hydrolysate-WPH is considered to be the predigested form of whey protein as it has already undergone partial hydrolysis-a process necessary for the body to absorb protein.