The masculine form of "benefactress" is "benefactor." A benefactor is an individual, typically a person of means, who provides financial support or assistance to a person, organization, or cause. While "benefactress" specifically refers to a female benefactor, "benefactor" is a gender-neutral term that can refer to anyone who provides such support.
A benefactress is a female benefactor.
The feminine form of benefactor is benefactress.
benefactress
That would be a benefactress.
Rosamond Oliver
benefactor, benefactress, contributor, donator, giver
There is no grammatical gender in the English noun. The word benefactress may be used for a female benefactor, but it is not necessary except to specify the person's gender, which of course is a form of sexism.
The benefactress of Lowood School in Jane Eyre is Mr. Brocklehurst's wealthy aunt, Miss Brocklehurst. She provides financial support to the school and has influence over its operations.
J. J. Colter has written: 'A gentle benefactress'
Benefactor is technically gender neutral, but benefactress is a specifically feminine form of the word.
Masculine
It is masculine.