S / sībĭlus
adjective

sībĭlus

fem. sībĭla · neut. sībĭlum
hissing; whistling poetic
hissing, whistling (poet.; occurring, on account of the metre, only in the form sibila; cf. 1. sibilus init.): colla (colubrae), Verg. G. 3, 421; id. A. 5, 277; cf. ora (anguium), id. ib. 2, 211: coma torvae frontis (Panis), Val. Fl. 3, 50.