/ ˈɪrɪgeɪt; NAmE / verb [ vn ]
1.
to supply water to an area of land through pipes or channels so that crops will grow :
irrigated land / crops
2.
( medical ) to wash out a wound or part of the body with a flow of water or liquid
► ir·ri·ga·tion / ˌɪrɪˈgeɪʃn; NAmE / noun [ U ]:
irrigation channels
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WORD ORIGIN
early 17th cent.: from Latin irrigat- moistened, from the verb irrigare , from in- into + rigare moisten, wet.