percussion-cap

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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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
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