Where does “roissier” come from?

roissier (Old French) comes from Vulgar Latin rustiare, from Latin rustia, from Late Latin rustum.

Ancestry of “roissier”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	rustiare	—
2	Latin	rustia	—
3	Late Latin	rustum	—

Words derived from “roissier”

Every word from Late Latin rustum →Every word from Latin rustia →Every word from Vulgar Latin rustiare →