A person that has the right to inherit money or property from someone who dies without a will.
A person who under law would inherit from an estate if the decedent did not leave a will. A person has no heir(s) until his or her death. A surviving spouse is an heir and his or her rights are superior to those of any other heirs.
Heir has been defined 5 different ways in documents like Legal Glossary, Probate Code, Section 20-88, Oregon Revised Statutes (2007), and 2 more.