tes·ta·tor \ˈteˌstād.ə(r), -ātə-, ̷ ̷ˈ ̷ ̷ ̷ ̷\noun (-s) Etymology: Middle English testatour, from Anglo-French, from Late Latin testator, from Latin testatus (past participle of testari to be a witness, make a will) + -or — more at testament 1.: a person who leaves a will or testament in force at his death 2.obsolete: one that testifies : witness