fratricide

[fra-tri-sahyd, frey-]
noun
1.
a person who kills his or her brother.
2.
the act of killing one's brother.

Origin:
1490–1500; (def 1) < Middle French < frātricīda, equivalent to frātri- (combining form of frāter) brother + -cīda -cide; (def 2) < Middle French < Late Latin frātricīdium, equivalent to frātricīd(a) + -ium noun suffix

fratricidal, adjective
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World English Dictionary
fratricide (ˈfrætrɪˌsaɪd, ˈfreɪ-)
 
n
1.  the act of killing one's brother
2.  a person who kills his brother
3.  military the destruction of or interference with a nuclear missile before it can strike its target caused by the earlier explosion of a warhead at a nearby target
 
[C15: from Latin frātricīda; see frater1, -cide]
 
fratri'cidal
 
adj

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

fratricide
mid-15c., from L. fratricida, from frater "brother" + cida "killer," or cidum "a killing," both from caedere "to kill, to cut down" (see concise). Related: Fratricidal.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The task of getting rid of civilian casualties and fratricide would be even
  tougher.
Until then, the two parties must develop ways of cohabiting, avoiding the
  fratricide of the past.
Sometimes comrades in arms die and the military call it fratricide or, more
  chillingly, friendly fire.
The practices of warfare and fratricide have ceased.
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