| FIR | (military) the relative capacity for delivering fire on a target |
|---|---|
| FIR | make resistant to fire |
| FIR | impervious to damage by fire |
| FIR | (nautical) chamber or compartment in which the furnaces of a ship are stoked or fired |
| FIR | home symbolized as a part of the fireplace (synecdoche) |
| FIR | an area near a fireplace (usually paved and extending out into a room |
| FIR | a sandstone that withstands intense heat |
| FIR | a piece of flint that is struck to light a fire |
| FIR | a storm in which violent winds are drawn into the column of hot air rising over a severely bombed area |
| FIR | any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries |
| FIR | a building that would be hard to escape from if it were to catch fire |
| FIR | (informal) the application of maximum thrust |