An interceptor was a type of high-speed jet-aircraft specifically designed to intercept and destroy enemy aircraft.
Captain John Christopher piloted an F-104 Starfighter, an interceptor equipped with missiles that were possibly armed with nuclear warheads. (TOS: "Tomorrow is Yesterday")
In starship classification, an interceptor was a type of armed starship designed to intercept incoming or hostile craft. To this end, interceptors typically have powerful warp or impulse engines.
Types of interceptors