noun (usually used with a singular verb)
the science or study of the motion of projectiles, as bullets, shells, or bombs.
the art or science of designing projectiles for maximum flight performance.

1745–55; see ballistic, -ics

ballistician [bal-uh-stish-uhn] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ballistics (bəˈlɪstɪks)
(functioning as singular) the study of the flight dynamics of projectiles, either through the interaction of the forces of propulsion, the aerodynamics of the projectile, atmospheric resistance, and gravity (exterior ballistics), or through these forces along with the means of propulsion, and the design of the propelling weapon and projectile (interior ballistics)

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1753, from L. ballista "ancient military machine for hurling stones," from Gk. ballistes, from ballein "to throw, to throw so as to hit," also in a looser sense, "to put, place, lay;" from PIE base *gwele- "to throw, reach," in extended senses "to pierce" (cf. Skt. apa-gurya "swinging," balbaliti "whirls,
twirls;" Gk. bole "a throw, beam, ray," belemnon "dart, javelin," belone "needle"). Here, too, probably belongs Gk. ballizein "to dance," lit. "to throw one's body," ancient Gk. dancing being highly athletic.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
ballistics   (bə-lĭs'tĭks)  Pronunciation Key 
The scientific study of the characteristics of projectiles, such as bullets or missiles, and the way they move in flight.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The laboratory, ballistics unit and polygraph unit, whose.
It could have applications in medicine, forensics, ballistics and biometrics.
They said the gun had been sent to a laboratory for ballistics tests to see if
  it had been used in the slaying.
Ballistics tests that could confirm a match are pending.
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