a venomous snake, Agkistrodon (Ancistrodon ) contortrix, of the eastern and southern U.S., having a light-brown to copper-red body marked with darker bands.
an extremely venomous but sluggish snake, Denisonia superba, of Australia and Tasmania, having a reddish to black body, depending on the region.
(initial capital letter) U.S. History. a Northern Democrat who opposed the Civil War, advocating peace and restoration of the Union even if slavery continued.
(initial capital letter) Military. a finned, 155mm cannon-launched U.S. Army artillery shell that homes on the target, using the reflection of a laser beam projected by a forward observer.

1765–75, Americanism; copper1 + head Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
copperhead (ˈkɒpəˌhɛd)
1.  a venomous reddish-brown snake, Agkistrodon contortrix, of the eastern US: family Crotalidae (pit vipers)
2.  a venomous reddish-brown Australian elapid snake, Denisonia superba
3.  informal (US) a Yankee supporter of the South during the Civil War

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

Trigonocephalus contortrix, 1775, Amer.Eng., so called for color markings between eyes; poisonous "sneak snakes" (because they bite without warning), the name is said to have been first used in reference to Northerners suspected of Southern sympathies in the New York "Tribune," July 20, 1861. Charles
H. Coleman, "The Use of the Term 'Copperhead' During the Civil War" ["Mississippi Valley Historical Review" 25 (1938), p.263] traces it to an anonymous letter against Ohio anti-war Democrats in the Cincinnati "Commercial" newspaper in the summer of 1861. It was in widespread use from summer 1862.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
As the family approaches, the copperhead braces for impact and prepares for defense.
While mistaken for northern water snake, copperhead bands are wider at belly, and taper to spine.
Aside from the timber rattlesnake, there is only one other species of venomous snake in the recreation area: the copperhead.
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