T / testātrix
noun

testātrix

gen. testātrīcis · gender feminine · decl. 3rd
testator, II.
she that makes a will; testament; a testatrix
she that makes a will or testament, a testatrix, Dig. 31, 1, 30; 31, 1, 35; 31, 1, 89 fin.; 36, 3, 18, § 1.