LATIN DICTIONARYLexicon Latīnum
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“irrigate” in Latin

The English word irrigate itself goes back to Latin rigō, through irrigātus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

irrigate
irrigare (the proper word; jugera quinquaginta prati, Cic.): ☞ rigare only poetical: aquam ducere or derivare (to conduct water by artificial courses, etc.; the land irrigated must be expressed by the accusative with in).

Quick answer

What is the Latin word for irrigate?
The usual Latin words for “irrigate” are irrigō, dērīvō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.