From Longman Dictionary of Contemporary EnglishCrown PrinceˌCrown ˈPrince noun [countable] PGOthe son of a king or queen, who is expected to become the next king
Examples from the Corpus
Crown Prince• But the crown prince is 71 himself, and, having only half-brothers within the royal family, may have difficulty ruling.• Conley is clearly the crown prince with 11 hostelries in the city with 774 rooms.• He sent the crown Prince to school at Le Rosey, the famous swiss establishment for the young international rich.• The crown prince countered by arranging full media coverage of a big National Guard training maneuver. 