princess royal

from WordNet (r) 3.0 (2006)
princess royal
    n 1: the eldest daughter of a British sovereign
    
from The Collaborative International Dictionary of English v.0.48
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.
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            So excellent a princess as the present queen.
                                                  --Swift.
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   2. The daughter of a sovereign; a female member of a royal
      family. --Shak.
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   3. The consort of a prince; as, the princess of Wales.
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   {Princess royal}, the eldest daughter of a sovereign.
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