rĕsŏnus, a, um, adj. [resono],
resounding , re-echoing (poet.): voces, Ov. M. 3, 496: valles, Luc. 7, 480: ictus, Val. Fl. 1, 618: ripae, Sil. 6, 285: resonas plaudere caetras, id. 3, 348.
resonus adj. re-+SON-, resounding, re-echoing : voces, O. ...
An Elementary Latin Dictionary