irrigation

noun

cleaning a wound or body organ by flushing or washing out with water or a medicated solution
傷あるいは体の器官を、水または薬用の液剤で洗い流したりすすいだりして清浄にすること
supplying dry land with water by means of ditches etc
溝などを使って乾いた土地に水を供給すること

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