baroness

noun

1. the wife of a baron.
2. a woman holding a baronial title in her own right.

noun

1. the wife or widow of a baron
2. a woman holding the rank of baron in her own right

n.

early 15c., from Old French barnesse “lady of quality, noblewoman” (also, ironically, “woman of low morals, slut”) or Medieval Latin baronissa (see baron).