8 letters · 9 points in Scrabble
verb supply with water, as with channels or ditches or streams
verb supply with a constant flow or sprinkling of some liquid, for the purpose of cooling, cleansing, or disinfecting
originFirst attested in 1615; borrowed from Latin irrigātus, perfect passive participle of irrigō, see -ate (verb-forming suffix). See also Middle English irrigat(e) (“watered, irrigated”).
Etymology from Wiktionary, CC BY-SA 3.0