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See more synonyms for drainage on Thesaurus.com
  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.
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Origin of drainage

First recorded in 1645–55; drain + -age
Related formso·ver·drain·age, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for drainage


  1. the process or a method of draining
  2. a system of watercourses or drains
  3. liquid, sewage, etc, that is drained away
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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

Word Origin and History for drainage


1650s, from drain + -age.

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Online Etymology Dictionary, © 2010 Douglas Harper

drainage in Medicine


  1. The removal of fluid or purulent material from a wound or body cavity.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.