Where does “périlleux” come from?

périlleux (French) comes from Old French perilleus, from Latin periculosus, from Latin -ōsus, from Old Latin -ōssus.

périlleux (French): perilous

Definitions

Step	Language	Word	Meaning
1	Old French	perilleus	perilous; very dangerous
2	Latin	periculosus	dangerous, hazardous, perilous
3	Latin	-ōsus	—
4	Old Latin	-ōssus	—

périlleux — Etymology, Origin & Word History | Etymology Explorer