Lewis & Short

ūlīgĭnōsus, a, um, adj. [uligo], full of moisture, wet, moist, damp, marshy (syn. umidus): locus, Varr. R. R. 1, 6, 6: campi, Col. 2, 4, 3: terra, Plin. 17, 5, 3, § 33: caprile, Varr. R. R. 2, 3, 6: viscera, i. e. dropsical, Arn. 1, 30.
Subst.: ūlīgĭnōsa, ōrum, n. (sc. loca), swamps, marshes, Plin. 36, 23, 55, § 176.