tonitrus ūs, m plurnom. and acc.tonitrūs m or tonitrua, n
tono, thunder : tonitrum secuti nimbi, O.: caelum tonitru contremit, C.poët.: tonitruque tremescunt Ardua terrarum, V.: tonitrūs sinistri, O.: inter fulmina et tonitrua: tempestas cum magno fragore tonitribusque, L.: movere tonitrūs, O.