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detonator

noun [C]
 
 
/ˈdet.ən.eɪ.tər/ US  /ˈdet̬.ən.eɪ.t̬ɚ/

Definition

a small amount of explosive in a bomb that explodes first and causes a larger explosion, or an electrical device that is used from a distance to make a bomb explodeExploding and eruptingDetonation and bombardment
(Definition of detonator noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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