percussion cap

English Thesaurus

1. a detonator that explodes when struck (noun.artifact)

hypernym	:	cap, detonating device, detonator,
definition	:	a mechanical or electrical explosive device or a small amount of explosive; can be used to initiate the reaction of a disrupting explosive (noun.artifact)

part holonym	:	fulminate of mercury, fulminating mercury, mercury fulminate,
definition	:	a fulminate that when dry explodes violently if struck or heated; used in detonators and blasting caps and percussion caps (noun.substance)