ir·ri·gate

[ir-i-geyt]
verb (used with object), ir·ri·gat·ed, ir·ri·gat·ing.
1.
to supply (land) with water by artificial means, as by diverting streams, flooding, or spraying.
2.
Medicine/Medical. to supply or wash (an orifice, wound, etc.) with a spray or a flow of some liquid.
3.
to moisten; wet.

Origin:
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

ir·ri·ga·tor, noun
non·ir·ri·gat·ed, adjective
non·ir·ri·gat·ing, adjective
o·ver·ir·ri·gate, verb (used with object), o·ver·ir·ri·gat·ed, o·ver·ir·ri·gat·ing.
re·ir·ri·gate, verb (used with object), re·ir·ri·gat·ed, re·ir·ri·gat·ing.
un·ir·ri·gat·ed, adjective
well-ir·ri·gat·ed, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
irrigate (ˈɪrɪˌɡeɪt) [Click for IPA pronunciation guide]
 
vb
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]
 
'irrigable
 
adj
 
irri'gation
 
n
 
irri'gational
 
adj
 
'irrigative
 
adj
 
'irrigator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

irrigate
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
The club uses recycled water from reverse osmosis to irrigate the grounds.
Not only is she not using city water to irrigate a lawn, she is keeping water
  from flooding the sewers.
Rather, what tends to happen is the water saved is then used- to irrigate a new
  field.
Irrigate artfully with water that sprays off the hoops of this copper kinetic
  sculpture.
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