I.sounding dreadfully, that makes a horrid sound (poet.): fretum, Cic. poët. Tusc. 2, 10, 23; cf. “flatus,” Luc. 2, 455: “fragor,” Lucr. 5, 109: “fremitus,” Verg. A. 9, 55: “cardo,” id. ib. 6, 573: “buxus,” Val. Fl. 2, 584: “flagellum,” id. 7, 149.
horrĭsŏnus , a, um, adj. horreo-sonus,