Webster's English Dictionary

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irrigate

ir.ri.gate \'ir-*-.ga-t\ \.ir-*-'ga--sh*n\ \'ir-*-.ga-t-*r\ vb [L 
   irrigatus, pp. of irrigare, fr. in- + rigare to wate]r 1: WET, MOISTEN; esp 
   : to supply (as land) with water  by artificial means 2: to refresh as if 
   by watering  : to practice irrigation  - ir.ri.ga.tion n