a type of battleship armed with heavy-caliber guns in turrets: so called from the British battleship Dreadnought, launched in 1906, the first of its type.
an outer garment of heavy woolen cloth.
a thick cloth with a long pile.
Also, dreadnaught.

1800–10; dread + nought

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World English Dictionary
dreadnought or dreadnaught (ˈdrɛdˌnɔːt)
1.  a battleship armed with heavy guns of uniform calibre
2.  an overcoat made of heavy cloth
3.  slang a heavyweight boxer
4.  a person who fears nothing
dreadnaught or dreadnaught

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"battleship," lit. "fearing nothing," the name of a ship in the Royal Navy c.1596, but modern sense is from the name of the first of a new class of British battleships mainly armed with big guns of one caliber, launched Feb. 18, 1906.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for dreadnought
World war i the first world war was an anticlimax for the great dreadnought fleets.
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