percussion cap

noun
a small metallic cap or cup containing fulminating powder, formerly exploded by percussion to fire the charge of small arms.

Origin:
1815–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
percussion cap
 
n
a detonator consisting of a paper or thin metal cap containing material that explodes when struck and formerly used in certain firearms

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
During the percussion cap era, breechloaders proliferated.
Other than the dimensions, the primer was similar to the familiar percussion
  cap of the muzzleloading era.
The final improvement in the fabrication of muzzle loading rifles was the
  introduction of the percussion cap.
Double-barreled muzzleloaders and percussion cap revolvers are not legal during
  the special muzzleloading season.
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