Where does “sibilant” come from?

Sibilant comes from Latin sibilans, the present participle of sibilo, derived from sibilus with the Latin nominative suffix -us, which developed from Old Latin -os, ultimately from Proto-Italic -os and Proto-Indo-European -ós.

sibilant (English): Characterized by a hissing sound such as the "s"...

Definitions

Characterized by a hissing sound such as the "s"...

Ancestry of “sibilant”, step by step

Step	Language	Word	Meaning
1	Latin	sībilāns	hissing, whistling
2	Latin	sībilō	to hiss
3	Latin	-ō	suffixed to nouns or adjectives. Originally a-stem nouns. Later extended to nouns with other stems. Forms regular first-conjugation verbs
4	Proto-Indo-European	-ō	Derives nouns from roots

Words derived from “sibilant”

sibilantly
non-sibilant
unsibilant

Every word from Proto-Indo-European -ō →Every word from Latin -ō →Every word from Latin sībilō →