the forward section of a self-propelled missile, bomb, torpedo, or the like, containing the explosive, chemical, or atomic charge.

1895–1900; war1 + head

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World English Dictionary
warhead (ˈwɔːˌhɛd)
the part of the fore end of a missile or projectile that contains explosives

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1898, "explosive part of a torpedo," from war + head. Later transf. to any missile (1944).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Although the warhead weighs less than two pounds, high precision increases its
But a warhead is a warhead, whatever the range for firing it.
It counts napalm and the cost of a nuclear warhead, and armored cars for police
  who fight riots in our streets.
When a warhead detonates, it squeezes the deuterium and tritium until they fuse
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