Main Entry: dau·phin

Pronunciation: \ˈdȯ-fən, ˈdō-; ˌdō-ˈfaⁿ\

Function: noun

Usage: often capitalized

Etymology: Middle English dolphin, from Anglo-French dolphyn, from Old French dalfin, title of lords of the Dauphiné, from Dalfin, a surname

Date: 15th century

: the eldest son of a king of France