Where does “jument” come from?

jument (French) comes from Old French jument, from Latin iumentum, from Old Latin iouxmentom, from Proto-Italic jouksmentom.

jument (French): mare

Definitions

Step	Language	Word	Meaning
1	Old French	jument	mare
2	Latin	iumentum	A draft animal, a beast of burden, a large...
3	Old Latin	iouxmentom	—
4	Proto-Italic	jouksmentom	—

jument — Etymology, Origin & Word History | Etymology Explorer