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noun plural but singular or plural in construction bal·lis·tics \bə-ˈlis-tiks\

: the science that studies the movement of objects (such as bullets or rockets) that are shot or forced to move forward through the air

Full Definition of BALLISTICS

a :  the science of the motion of projectiles in flight
b :  the flight characteristics of a projectile
a :  the study of the processes within a firearm as it is fired
b :  the firing characteristics of a firearm or cartridge

First Known Use of BALLISTICS

circa 1737
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