testātrix, īcis, f. [testator, II.],
she that makes a will or testament , a testatrix , Dig. 31, 1, 30; 31, 1, 35; 31, 1, 89 fin. ; 36, 3, 18, § 1.
·noun A woman who makes and leaves a will at death; a female testator. ...
Webster's Dictionary of the English Language