Ir-rig'ū-oŭs, a.
a. [Lat. irriguus, It. irriguo. See IRRIGATE.]
Sense 1. Watered; watery; moist.
The flowery lap Of some irriguous valley spreads her store. Milton.
Fanned by the breath of zephyrs, and with rills From bubbling founts irriguous. Glover.
Sense 2. Dewy; moist. [Very rare.]
To exhale his surfeit by irriguous sleep. Phillips.
Johnson remarks that “Philips seems to have mistaken the Latin phrase irrig(u)us sopor,” i. e., strengthening or nourishing sleep.