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From Biology-Online Dictionary
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1. to water; to wet; to moisten with running or dropping water; to bedew.

2. (Science: agriculture) to water, as land, by causing a stream to flow upon, over, or through it, as in artificial channels.

Origin: L. Irrigatus, p. P. Of irrigare to irrigate: ir- in _ rigare to water; prob. Akin to E. Rain. See rain.