Prin·cess n.
  1. A female prince; a woman having sovereign power, or the rank of a prince.
     So excellent a princess as the present queen.   --Swift.
  2. The daughter of a sovereign; a female member of a royal family.
  3. The consort of a prince; as, the princess of Wales.
  Princess royal, the eldest daughter of a sovereign.
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  princess royal
       n : the eldest daughter of a British sovereign