headmistress

[hed-mis-tris] /ˈhɛdˈmɪs trɪs/
noun
1.
a woman in charge of a private school.
Origin
1870-75; head + mistress
Related forms
headmistress-ship, noun
Usage note
See -ess.
British Dictionary definitions for headmistress

headmistress

/ˌhɛdˈmistrəs/
noun
1.
a female principal of a school Gender-neutral form head teacher
Derived Forms
headmistressship, noun