Lewis Short
(adj.Subst.) : fontānus, a, um, adj.id.
* Of or from a spring or fountain, spring-.
* Adj.: aqua,Cels. 2, 18; Col. 12, 9, 2: ora,Ov. F. 1, 269.
* Subst., in late Lat.: fontāna, ae, f., a spring, fountain, Innocent. de Cas. p. 245 Goes.
Charlton T. Lewis, Charles Short, A Latin Dictionary