Русско-англо-русский юридический словарь

"A testamentary heir is one who is constituted heir by testament executed in the form prescribed by law. He is so called to distinguish him from the legal heirs, who are called to the succession by the law ( and from conventional heirs, who are so constituted by a contract inter vivos.")

Testamentary disposition is the disposition or transfer of property that takes effect upon the death of the person making it. The testator retains almost entire control of the property until death. In short, it is the gift of property which takes effect at the time of the death of the person making the disposition. (USLegal)

testamentary instrument. Will or any other document that creates, extinguishes, or transfers an interest in, or right to, an asset or property. Also called testamentary document. (BusinessDictionary)