Heir, irregular
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
In Louisiana. Irregular heirs are those who are neither testamentary nor legal, and who have been established by law to take the succession. See Civ. Co.de La. art. 874. When there are no direct or collateral relatives surviving the decedent, and the succession consequently devolves upon the surviving husband or wife, or illegitimate children, or the state, it is called an "irregular succession."
Defined under Heir in Black's Law Dictionary.