1. 
   crown prince
   [n] - a male heir apparent to a throne
   Found op http://www.webdictionary.co.uk/definition.php?query=crown%20prince
   
   
2. 
   crown prince
   noun a male heir apparent to a throne
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=crown%20prince
   
   
3. 
   Crown prince
   A crown prince or crown princess is the heir or heiress apparent to the throne in a royal or imperial monarchy. The wife of a crown prince is also titled crown princess. The term is now borne as a title only in Thailand and the Scandinavian monarchies;{Citation needed|date=August 2009} but it may a...
   Found op http://en.wikipedia.org/wiki/Crown_prince
   
   
4. 
   crownprince
   1) King-to-be
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/crownprince/1
   
   

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