Definition - What does Testatrix mean?
The term "testatrix" refers to a woman responsible for making a will. Traditionally, the word "testator" has been used to refer to a man responsible for making a will. However, distinguishing based on gender is becoming less common these days.
Justipedia explains Testatrix
Testatrix can simply be understood as the female version of testator. However, "testratix" is being used less and less often, and now "testator" can refer to either gender.