irrigably en · ADV
Etymology
From irrigable + -ly.
Meanings
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(not-comparable) Such that it can be irrigated.
A few hundred yards above these savage jaws was the town-site. A ribbon of irrigably level land a few rods wide, threaded by a sparkling rivulet, hemmed with glistening cliffs of white pumice-stone fifteen hundred feet tall, murmurous with stately pines and shivering aspens […]
1893, Charles Fletcher Lummis, The Land of Poco Tiempo, page 138: