Lewis Short
ūlīgo (noun F) : contr. from uviligo, from uveo, uvens, uvesco, uvidus, etc.
* Moisture, marshy quality of the earth (syn. umor), Varr. R. R. 2, 2, 7; Col. 1, 6, 16; 2, 9, 9; Verg. G. 2, 184; cf. Serv. ad loc.; Sil. 8, 381; Tac. A. 1, 64.
Charlton T. Lewis, Charles Short, A Latin Dictionary