Etymology
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Words related to duke

*deuk- 
Proto-Indo-European root meaning "to lead."

It forms all or part of: abduce; abducent; abduct; abduction; adduce; aqueduct; circumduction; conduce; conducive; conduct; conductor; conduit; deduce; deduction; dock (n.1) "ship's berth;" doge; douche; ducal; ducat; Duce; duchess; duchy; duct; ductile; duke (n.); educate; education; induce; induction; introduce; introduction; misconduct; produce; production; reduce; reduction; seduce; seduction; subduce; subduction; taut; team (n.); teem (v.1) "abound, swarm, be prolific;" tie (n.); tow (v.); traduce; transducer; tug; zugzwang.

It is the hypothetical source of/evidence for its existence is provided by: Latin dux (genitive ducis) "leader, commander," in Late Latin "governor of a province," ducere "to lead;" Old English togian "to pull, drag," teonteon "to pull, drag;" German Zaum "bridle," ziehen "to draw, pull, drag;" Middle Welsh dygaf "I draw."
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earl (n.)

Old English eorl "brave man, warrior, leader, chief" (contrasted with ceorl "churl"), from Proto-Germanic *erlaz, which is of uncertain origin. In Anglo-Saxon poetry, "a warrior, a brave man;" in later Old English, "nobleman," especially a Danish under-king (equivalent of cognate Old Norse jarl), then one of the viceroys under the Danish dynasty in England. After 1066 adopted as the equivalent of Latin comes (see count (n.1)).

Earl Gray tea (1880s) was originally a Chinese tea blended with bergamot oil, supposedly from a recipe given to Charles, second Earl Gray (the Whig prime minister), in the 1830s, but perhaps it was named later, commercially, in his honor.

archduke (n.)

1520s, from French archeduc (Modern French archiduc), from Merovingian Latin archiducem (c. 750); see arch- + duke (n.). Formerly the title of the rulers of Austrasia, Lorraine, Brabant, and Austria; later the titular dignity of the sons of the Emperor of Austria. Related: Archducal; archduchy.

duchess (n.)

"female sovereign of a duchy; consort or widow of a duke," c. 1300, from Old French duchesse, from Late Latin or Medieval Latin ducissa, fem. of dux "duke" (see duke (n.)). Often spelled dutchess until early 19c. (as in Dutchess County, New York, U.S.).

duchy (n.)

mid-14c., "territory ruled by a duke or duchess," from Old French duché (12c.), from Medieval Latin ducatus "territory of a duke," from Latin dux "leader" (see duke (n.)).

dukedom (n.)

"a duchy," mid-15c., from duke + -dom.

dukes (n.)

"hands," 1874, now mainly in put up your dukes (phrase from 1859), probably not connected to duke (n.). Chapman ["Dictionary of American Slang"] suggests Romany dook "the hand as read in palmistry, one's fate;" but Partridge ["Slang To-day and Yesterday"] gives it a plausible, if elaborate, etymology as a contraction of Duke of Yorks, rhyming slang for forks, a Cockney term for "fingers," thus, by extension, "hands."