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
Concern about fratricidal effects can be a motivation in hardening some types of weapons.
For one thing, fratricidal conflicts still tear at our world.
So they are still capable of drawing back from a fratricidal war.
In the past, it has been split by fratricidal disputes.
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