Lewis Short
(adjective) : altĭtŏnans, antis, alte-tonans
* Thundering from on high: Juppiter,Enn. Ann. 2, 6: pater altitonans,i. e. Jupiter,Cic. Carm. Div. 1, 12.—Hence, in gen., of wind, loud-roaring: Volturnus, * Lucr. 5, 745.
Charlton T. Lewis, Charles Short, A Latin Dictionary