duke

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A nobleman with the highest hereditary rank, especially a man of the highest grade of the peerage in Great Britain.
• noun A sovereign prince who rules an independent duchy in some European countries.
• noun Used as the title for such a nobleman.
• noun Slang The fists.
• noun Botany A type of cherry intermediate between a sweet and a sour cherry.
• intransitive verb To fight, especially with fists.

from The Century Dictionary.

• noun A chief; a prince; a commander; a leader: as, “the dukes of Edom,”
• noun In Great Britain, France, Italy, Spain, and Portugal, a hereditary title of nobility, ranking next below that of prince, but in some instances a sovereign title, as in those of the dukes of Burgundy, Normandy, Lorraine, etc. (see 3, below), or borne as his distinguishing title by a prince of the blood royal.
• noun A sovereign prince, the ruler of a state called a duchy.
• noun A name of the great eagle-owl of Europe, Bubo maximus, called grand-duc by the French.
• noun plural The fists.
• noun A dialectal (Scotch) form of duck.
• noun A vehicle having a victoria body suspended at the front on scroll-irons. At the rear is a rumble for a footman. It is sometimes driven by a postilion. Now called a ladies' driving-phaëton.
• To play the duke.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb Poetic To play the duke.
• transitive verb slang To beat with the fists.
• transitive verb to fight; -- usually implying, to fight with the fists; to settle a dispute by fighting with the fists. See duke, n. sense 4.
• noun obsolete A leader; a chief; a prince.
• noun In England, one of the highest order of nobility after princes and princesses of the royal blood and the four archbishops of England and Ireland.
• noun In some European countries, a sovereign prince, without the title of king.
• noun slang The fists.
• noun See Illust. of Coronet.
• noun to go without dinner. See under Dine.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The male ruler of a duchy (compare duchess).
• noun A high title of nobility; the male holder of a dukedom.
• noun A grand duke.
• noun slang, usually in plural A fist.
• verb transitive To hit or beat with the fists.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a nobleman (in various countries) of high rank
• noun a British peer of the highest rank