The Collaborative International Dictionary
Supportress
Supportress \Sup*port"ress\, n. A female supporter. [R.]
You are my gracious patroness and supportress.
--Massinger.
Wiktionary
supportress
n. (context archaic English) A female supporter.
Usage examples of "supportress".
A haunting music, sole perhaps and lone Supportress of the faery-roof, made moan Throughout, as fearful the whole charm might fade.