Where does “horripilātus” come from?

horripilātus (Latin) comes from Latin horripilō, from Latin pīlus, from Latin pīlum, from Proto-Italic pistlom, from Proto-Indo-European pis-tlo-, from Proto-Indo-European peys- — to grind, to crush.

Ancestry of “horripilātus”, step by step

Step	Language	Word	Meaning
1	Latin	horripilō	to bristle with hairs, to be shaggy
2	Latin	pīlus	a hair
3	Latin	pīlum	a pounder, pestle
4	Proto-Italic	pistlom	—
5	Proto-Indo-European	pis-tlo-	—
6	Proto-Indo-European	peys-	to grind, to crush

Words derived from “horripilātus”

horripilated
horripilating
horripilate

Every word from Proto-Indo-European peys- →Every word from Proto-Indo-European pis-tlo- →Every word from Proto-Italic pistlom →