Lewis Short
furnus | fornus (noun M) : (, Varr. ap. Non. 531, 32), , Sanscr. ghar-, to lighten; cf.: fornus, fornax, and v. formus
* An oven (syn.: caminus, fornax, clibanus): in furnum calidum condito,Plaut. Cas. 2, 5, 1: malim istius modi mi amicos furno mersos quam foro,id. Ep. 1, 2, 16; Varr. l. l.; Plin. 13, 4, 9, § 48; 19, 1, 3, § 18; 20, 9, 39, § 99; Ov. F. 6, 313. Used by the Romans as a warming-place, Hor. S. 1, 4, 36; id. Ep. 1, 11, 13.
Charlton T. Lewis, Charles Short, A Latin Dictionary