n.
长公主

[ noun ]
the eldest daughter of a British sovereign
<noun.person>

Princess \Prin"cess\, n. [F. princesse. See {Prince}, and cf.
{Princesse}.]
1. A female prince; a woman having sovereign power, or the
rank of a prince. --Dryden.

So excellent a princess as the present queen.
--Swift.

2. The daughter of a sovereign; a female member of a royal
family. --Shak.

3. The consort of a prince; as, the princess of Wales.

{Princess royal}, the eldest daughter of a sovereign.