riguus, a, um, adj. rigo (perh. not ante-Aug.). Act., that waters, irrigates; watering, irrigating: in vallibus amnes, Verg. G. 2, 485.

— Pass., watered, wellwatered: hortus, Ov. M. 8, 646; 10, 190; 13, 797: pratum, Col. 2, 16, 3: mons scatebris fontium, Plin. 5, 1, 1, § 6.

—Transf.: quae plurimo lacte rigua bos est, i. e. distended with milk, Sol. 2.

— Hence, subst.: rigua, ōrum, n., well-watered places: circa Babylonis rigua, Plin. 9, 57, 83, § 175; 17, 26, 39, § 247; so once in sing.: riguus, i, m. (sc. ager), a well-watered place, id. 17, 26, 41, § 250.