1. (

• bullet ,
• slug

) a projectile that is fired from a gun ;

2. (

• bullet_train ,
• bullet ,

) a high-speed passenger train ;

3. (

• fastball ,
• heater ,
• smoke ,
• hummer ,
• bullet

) (baseball) a pitch thrown with maximum velocity; "he swung late on the fastball"; "he showed batters nothing but smoke" ;