Webster's Revised Unabridged Dictionary · 1913

Heir

Heir (âr) , noun

[Old English heir, eir, hair, Old French heir, eir, French hoir, Latin heres; of uncertain origin. Compare Hereditary, Heritage.]

1.
One who inherits, or is entitled to succeed to the possession of, any property after the death of its owner; one on whom the law bestows the title or property of another at the death of the latter.
I am my father's heir and only son. — Shakespeare
2.
One who receives any endowment from an ancestor or relation; as, the heir of one's reputation or virtues.
And I his heir in misery alone. — Pope
Collocations (3)
Heir apparent (Law.) , See under Apparent.
Heir at law , one who, after his ancector's death, has a right to inherit all his intestate estate. — Wharton (Law Dict.)
Heir presumptive , one who, if the ancestor should die immediately, would be his heir, but whose right to the inheritance may be defeated by the birth of a nearer relative, or by some other contingency.

Heir , transitive verb

To inherit; to succeed to. [Rare]
One only daughter heired the royal state. — Dryden