Lewis Short
(preposition) : uls (ouls;
* V.infra), with acc. [from the pronominal root il, whence ille], beyond; opp. to cis (ante-class.): uls Cato pro ultra posuit,Fest. p. 379 Müll.: ouls lucum facutalem (followed by cis lucum Esquilinum), Form. Sacr. Argeor. ap. Varr. L. L. 5, § 50 ib.: et uls et cis Tiberim,Varr. ib. 5, § 83: quinqueviri constituti sunt cis Tiberim et uls Tiberim,Dig. 1, 2, 2, § 31; cf. Gell. 12, 13, 8.
Charlton T. Lewis, Charles Short, A Latin Dictionary