Benefactress (noun)

A woman who makes a gift or bequest for a charitable purpose, especially to an institution or organization.

Origin:

Late middle english benefactresse, from old french, from latin benefactrix, from bene facere to do good + -trix (as in matrix matrix).

Examples:

1. The benefactress gave a large sum of money to the orphanage.
2. The school was built thanks to the generosity of a wealthy benefactress.
3. Many museums have benefactresses who support their collections.
4. The benefactress wished to remain anonymous, but her gift was greatly appreciated.
5. The university was forever grateful to its benefactress, who had made a significant contribution to its endowment.