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.
If you know that whey is one of the proteins found in milk, then it should be obvious that whey protein production starts with dairy cows. Cows are milked on the farm, and this milk is the starting source for most protein powders.