| 1. | the act or process of draining. |
| 2. | a system of drains, artificial or natural. |
| 3. | drainage basin. |
| 4. | something that is drained off. |
| 5. | Surgery. the drainage of fluids, as bile, urine, etc., from the body, or of pus and other diseased products from a wound. |
drainage drain·age (drā'nĭj)
n.
The removal of fluid or purulent material from a wound or body cavity.
drainage
in agriculture, the artificial removal of water from land; drainage is employed in the reclamation of wetlands, in the prevention of erosion, and as a concomitant of irrigation in the agriculture of arid regions
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