[dau.phin] n, often cap [ME dolphin, fr. MF dalfin, fr. OF, title of lords of the Dauphine, fr. Dalfin, a surname] (15c): the eldest son of a king of France
DAUPHIN
Meaning of DAUPHIN in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012