Толковый словарь английского языка Oxford English Reference - duke

n. (as a title usu. Duke) 1 a a person holding the highest hereditary title of the nobility. b a sovereign prince ruling a duchy or small State. 2 (usu. in pl.) sl. the hand; the fist (put up your dukes!). 3 Bot. a kind of cherry, neither very sweet nor very sour. Phrases and idioms royal duke a duke who is also a royal prince. Etymology: ME f. OF duc f. L dux ducis leader