matron

A married woman or a widow, especially a mother of dignity, mature age, and established social position.

A woman who acts as a supervisor or monitor in a public institution, such as a school, hospital, or prison.

A married woman, especially an elderly married woman, or a woman old enough to be the mother of a family, whether actually so or not; a woman possessing the gravity suitable to a mother.

In a special sense, a head nurse in a hospital; the female head or superintendent of any institution.

A wife or a widow, especially, one who has borne children; a woman of staid or motherly manners.