irrigatev. t.[L. irrigatus, p. p. of irrigare to irrigate: ir- in + rigare to water; prob. akin to E. rain. See Rain.]()1. To water; to wet; to moisten with running or dropping water; to bedew.()2. (Agric.) To water, as land, by causing a stream to flow upon, over, or through it, as in artificial channels.()3. (Med.) To rinse (a wound, infected area, etc.) with a flow or spray of a liquid.()