(law) One who makes or has made a legally valid will.

(law) having left a legally valid last will and testament (of one who has died).

(law) one who has left a valid will and testament

(zoology) Having a test (external calciferous shell or endoskeleton)

(law) of or pertaining to a will or testament

plural of testament

Susceptible to being tested. / With respect to the scientific method, capable of being proven true or false. / (law) Capable of being devised, or given by will.

(law) the condition of being testate; of having left a valid will at one's death

(obsolete) Pertaining to earthenware or baked clay. / Having a shell, especially one which is not articulated. / Of a dull orange or brownish colour, like brick.

plural of testatrix