Русско-англо-русский юридический словарь

When the heir in the first generation of a branch predeceased the decedent, the share that would have been given to the heir would be distributed among the heir's issue in equal shares. (Wikipedia)

relation to the successor, that the ancestor does to the heir." (Lectric Law Library)

A pretermitted heir is a term used in the law of property to describe a person who would likely stand to inherit under a will, except that the testator (the person who wrote the will) did not know, or did not know of, the party at the time the will was written. (Wikipedia)

"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.")