Definition of firing pin in English:

firing pin

Syllabification: fir·ing pin

Entry from US English dictionary

noun

A movable pin in a firearm that strikes the primer of a cartridge to set off the charge.

Definition of firing pin in:

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Word of the day humoresque
Pronunciation: ˌ(h)yo͞oməˈresk
noun
a short, lively piece of music