noun
primer
A small explosive cap that ignites ammunition.
The firing pin strikes the primer at the cartridge's base.
Etymology
Primer names something that primes or prepares. In ammunition, the small initial charge starts the ignition that sets off the main propellant.
More examples
- A faulty primer can keep a cartridge from firing.
- The technician checks the primers for signs of corrosion.
- This primer shows a dent from the firing pin.
Forms
primer · primers
prime verb — Prepare a firearm for firing.
Similar words
- cap
- Often refers specifically to a percussion cap on older firearms.
- igniter
- Broader term for devices that start combustion, not just ammunition.