Where does “horrisonous” come from?

horrisonous (English) comes from Latin horrisonus, from Latin horreō, from Proto-Italic horzēō, from Proto-Indo-European ǵʰr̥séh₁(ye)ti.

horrisonous (English): Sounding dreadfully; uttering a terrible sound

Definitions

Step	Language	Word	Meaning
1	Latin	horrisonus	That makes a horrid sound
2	Latin	horreō	—
3	Proto-Italic	horzēō	—
4	Proto-Indo-European	ǵʰr̥séh₁(ye)ti	—

horrisonous — Etymology, Origin & Word History | Etymology Explorer