Pronunciation: (drā'nij), [key]
1. the act or process of draining.
2. a system of drains, artificial or natural.
3. See drainage basin.
4. something that is drained off.
5. Surg.the drainage of fluids, as bile, urine, etc., from the body, or of pus and other diseased products from a wound.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.