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[drey-nij] /ˈdreɪ nɪdʒ/
the act or process of draining.
a system of drains, artificial or natural.
something that is drained off.
Surgery. the drainage of fluids, as bile, urine, etc., from the body, or of pus and other diseased products from a wound.
Origin of drainage
1645-55; drain + -age
Related forms
overdrainage, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for drainage
  • Make sure the location has good drainage, since you don't want water to collect around the frame after every rain.
  • It has a primary school, running water and some drainage.
  • For example they over filled one tank and gasoline was running down the street and into the water drainage system.
  • Decades of drainage projects has vastly decreased the recharge rate of the aquifer.
  • We're not exactly talking swimming in an infinity pool as opposed to a drainage ditch here, people.
  • drainage in the marketplace was plugged by uncollected garbage and customers stopped coming.
  • drainage gratings and manhole covers are upended, posing hazards to drivers.
  • The bag features a slot in the bottom for drainage and ventilation slats.
  • Streets flood almost immediately because drainage is almost non-existent.
  • Storm drainage is designed based on the water level at the downstream end.
British Dictionary definitions for drainage


the process or a method of draining
a system of watercourses or drains
liquid, sewage, etc, that is drained away
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for drainage

1650s, from drain + -age.

Online Etymology Dictionary, © 2010 Douglas Harper
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drainage in Medicine

drainage drain·age (drā'nĭj)
The removal of fluid or purulent material from a wound or body cavity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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