S / sībĭlātĭo
noun

sībĭlātĭo

gen. sībĭlātōnis · gender feminine · decl. 3rd
(collat. form , Non. 531, 4), , sibilo
a sibilation; hissing
a sibilation, hissing (late Lat.): serpentium, Vulg. Sap. 17, 9: vel stridor, Cael. Aur. Tard. 2, 14, 198.