verb (used with object), irrigated, irrigating.
to supply (land) with water by artificial means, as by diverting streams, flooding, or spraying.
Medicine/Medical. to supply or wash (an orifice, wound, etc.) with a spray or a flow of some liquid.
to moisten; wet.

1605–15; < Latin irrigātus, past participle of irrigāre to wet, flood, nourish with water, equivalent to ir- ir-1 + rigā- (stem of rigāre to provide with water, soak) + -tus past participle suffix

irrigator, noun
nonirrigated, adjective
nonirrigating, adjective
overirrigate, verb (used with object), overirrigated, overirrigating.
reirrigate, verb (used with object), reirrigated, reirrigating.
unirrigated, adjective
well-irrigated, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
irrigate (ˈɪrɪˌɡeɪt)
1.  to supply (land) with water by means of artificial canals, ditches, etc, esp to promote the growth of food crops
2.  med to bathe or wash out a bodily part, cavity, or wound
3.  (tr) to make fertile, fresh, or vital by or as if by watering
[C17: from Latin irrigāre, from rigāre to moisten, conduct water]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1623, from L. irrigatus, pp. of irrigare "lead water to, refresh," from in- "in" + rigare "to water, to moisten," of uncertain origin, perhaps cognate with O.E. regn "rain."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

irrigate ir·ri·gate (ĭr'ĭ-gāt')
v. ir·ri·gat·ed, ir·ri·gat·ing, ir·ri·gates
To wash out a cavity or wound with a fluid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Soon severe heat waves will routinely destroy non-irrigated crops.
They can then be irrigated together, and no plant will receive too much or too
  little water.
In arid regions, it makes a great groundcover for areas of the garden that
  won't be planted and irrigated.
Describe the cliff dwellings where they lived and how they farmed and irrigated
  their lands.
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