Where does “horrendo” come from?

horrendo (Portuguese) comes from Latin horrendus, from Latin horreō, from Proto-Italic horzēō, from Proto-Indo-European ǵʰr̥séh₁(ye)ti.

horrendo (Portuguese): gruesome

Definitions

Step	Language	Word	Meaning
1	Latin	horrendus	horrible, horrendous
2	Latin	horreō	—
3	Proto-Italic	horzēō	—
4	Proto-Indo-European	ǵʰr̥séh₁(ye)ti	—

horrendo — Etymology, Origin & Word History | Etymology Explorer