Definition of TESTATOR: (noun) / one who makes and executes a last will and testament, for example, if Tiffany has a will drafted and she executes the will, then Tiffany is referred to as the Testator. When Tiffany subsequently passes away, she is said to have died “testate”, or with a will.
A probate attorney is often involved in drafting and reviewing wills to ensure the testator’s wishes are legally valid and properly executed.
The word "testatrix" used to be regularly applied as the female equivalent of "testator". It is less common today especially in the Surrogate's Courts of the 5 boroughs of New York City. Usage of the suffix "-trix" as applied to any word to indicate the female version is becoming increasingly outdated.