a highly emotional and quick-tempered person (especially a girl or woman)
"Don't try to reason with her; she's such a spitfire that she'll scream before you can finish your first word."
A cannon
"The museum display featured a pristine Spitfire that had flown hundreds of sorties defending London during the Battle of Britain."
A single-seat fighter used by the RAF and allies during World War II, especially during the Battle of Britain.