Closed drainage - definition of closed drainage by The ...

drain·age (drā′nĭj) n. 1. The action or a method of draining. 2. A system of drains. 3. Something that is drained off. 4. Medicine The removal of fluid or purulent material from a wound or body cavity. drainage (ˈdreɪnɪdʒ) n 1. the process or a method of draining 2. (Civil Engineering) a system of watercourses or drains 3. liquid, sewage, etc ...

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