[ noun uhn-der-dreyn; verb uhn-der-dreyn ]

  1. a drain placed beneath the surface of cultivated fields, streets, etc.

verb (used with object)
  1. to equip or supply with an underdrain or underdrains.

Origin of underdrain

First recorded in 1795–1805; under- + drain

Words Nearby underdrain

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use underdrain in a sentence

  • I would urge no farmer to plunge up to his neck into debt in order to underdrain his farm.

    What I know of farming: | Horace Greeley

British Dictionary definitions for underdrain


  1. a drain buried below agricultural land

  1. to bury such drains below (agricultural land)

Derived forms of underdrain

  • underdrainage, noun

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