Ecnephias, genus procelle. Pl. A storme wher a clowd is brokÊ and falleth.
Lewis and Short: Latin dictionary
ecnĕphĭas, ae, m., = e)knefi/as, a hurricane supposed to be produced by blasts from two opposite clouds, Plin. 2, 48, 49, 131 (in Sen. Q. N. 5, 12, written as Greek).