Definition of matrons:
(n) :
A woman in charge of the domestic arrangements of an establishment or institution, especially, the nursing officer or chief nurse of a hospital.
(n) :
A mature or elderly woman, especially one of a higher social rank.
(n) :
A woman with the character of a mother or matriarch.
(n) :
A housekeeper, especially, a woman who manages the domestic economy of a public institution.
(n) :
A wife or a widow, especially, one who has borne children.
(n) :
(US) A female prison officer.