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.
Pure Whey Protein Isolated 90% (Unflavored) Bulk Powder. Whey is a by-product during cheese production, a dietary supplementation created by separating components from milk after the milk has curdled and coagulated.