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archduke

[ahrch-dook, -dyook]
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noun
  1. a title of the sovereign princes of the former ruling house of Austria.
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Origin of archduke

1520–30; earlier archeduke < French archeduc (now archiduc). See arch-1, duke
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for archduke

archduke

noun
  1. a chief duke, esp (since 1453) a prince of the Austrian imperial dynasty
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for archduke

n.

1520s, from Middle French and Old French archeduc, 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.

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Online Etymology Dictionary, © 2010 Douglas Harper