bullet
US /ˈbʊl.ɪt/
UK /ˈbʊl.ɪt/

1.
a small metal projectile, pointed or rounded, fired from a rifle, pistol, or machine gun
:
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The detective found a spent bullet casing at the crime scene.
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The soldier loaded a fresh bullet into his rifle.
a small metal projectile, pointed or rounded, fired from a rifle, pistol, or machine gun