irrigation

nouns

supplying dry land with water by means of ditches etc
is derived from
is a type of (narrower)
the activity of supplying or providing something
(medicine) cleaning a wound or body organ by flushing or washing out with water or a medicated solution
is derived from
domain category
the branches of medical science that deal with nonsurgical techniques
is a type of (narrower)
professional treatment for illness or injury