Definition(s)
Extinguisher
An extinguisher is an appliance containing an extinguishing medium, which can be expelled by the action of internal pressure and be directed into a fire. This pressure may be stored pressure or be obtained by release of gas from a cartridge.
Source: IMO Resolution A.951(23), Improved Guidelines for Marine Portable Fire Extinguishers, 25 February 2004, International Maritime Organization. Regulatory Guidance