(1) Formerly, the eldest son of the King of France and direct heir to the throne
WiktionaryText
Noun
The eldest son of the king of France. Under the Valois and Bourbon dynasties, the Dauphin of France, generally shortened to Dauphin, was heir apparent to the throne of France. The title derived from the main title of the Dauphin, Dauphin of Viennois.
