(noun) a projectile that is fired from a gun. Synonyms: slug.
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Noun Definition 1
(noun) a high-speed passenger train. Synonyms: bullet train.
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Noun Definition 2
(noun)(baseball) a pitch thrown with maximum velocity. Synonyms: fastball, heater, smoke, hummer. Examples:"He swung late on the fastball.""He showed batters nothing but smoke."