duke

(do͞ok, dyo͞ok)

1. A nobleman with the highest hereditary rank, especially a man of the highest grade of the peerage in Great Britain.
2. A sovereign prince who rules an independent duchy in some European countries.
3. Abbr. D. or Du. Used as the title for such a nobleman.
4. Slang A fist. Often used in the plural: Put up your dukes!
5. Botany A type of cherry intermediate between a sweet and a sour cherry.