A female testator is sometimes referred to as a testatrix (/tɛsˈteɪtrɪks/), plural testatrices (/tɛstəˈtraɪsiːs/), particularly in older cases.
In Ahmadiyya Islam, a testator is referred to as a moosi, who is someone that has signed up for Wasiyyat or a will, under the plan initiated by the Promised Messiah, thus committing a portion, not less than one-tenth, of his lifetime earnings and any property to a cause.
The adjectival form of the word is testamentary, as in:
A will is also known as a last will and testament.
Testacy means the status of being testate, that is, having executed a will. The property of such a person goes through the probate process.
Intestacy means the status of not having made a will, or to have died without a valid will. The estate of a person who dies intestate, undergoes administration, rather than probate.
The attestation clause of a will is where the witnesses to a will attest to certain facts concerning the making of the will by the testator, and where they sign their names as witnesses.