Definition of dauphin noun from the Oxford Advanced Learner's Dictionary

 

dauphin

 noun
noun
BrE BrE//ˈdəʊfæ̃//
 
; NAmE NAmE//ˈdoʊfæ̃//
 
; BrE BrE//ˈdəʊfæn//
 
; NAmE NAmE//ˈdoʊfæn//
 
(old use)
 
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the oldest son of the king of France Word OriginFrench, from the family name of the lords of the Dauphiné, an area of SE France: ultimately a nickname meaning ‘dolphin’. In 1349 the future Charles V acquired the lands and the title; when king he ceded them to his eldest son, establishing the practice of passing both title and lands to the Crown prince.
See the Oxford Advanced American Dictionary entry: dauphin