I am my father's heir and only son.

Shak.

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.

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.

The Gutenberg Webster's Unabridged Dictionary: Section F, G and H · 第 2389 / 2879 题