Definition of: drain

(drān) v.t.
1. To draw off gradually, as a fluid; cause to run off.
2. To draw water or any fluid from: to drain a swamp.
3. To empty; drink completely.
4. To filter.
5. To exhaust; use up: to drain one's vitality; to drain a region of resources.
—v.i.
6. To flow off or leak away gradually.
7. To become empty.
—noun
1. The act of draining.
2. Continuous strain, leak, or outflow.
3. A pipe or trench for draining; a drainpipe.
4. Surg. An appliance to facilitate the discharge of matter from a wound.
5. plural Draff. [OE drēahnian strain out]
—drain′er noun