Fratricide Definition
 frătrĭ-sīd 
    noun
  
 The act of killing one's own brother or sister.
 Webster's New World 
A person who kills his or her own brother or sister.
 Webster's New World 
The act of killing relatives or fellow-countrymen, as in a civil war.
 Webster's New World 
Other Word Forms of Fratricide
Noun
Singular:
 fratricidePlural:
 fratricidesOrigin of Fratricide
-  
Middle English from Old French from Latin frātricīdium frātricīda frāter frātr- brother bhrāter- in Indo-European roots -cīdium -cīda -cide
From American Heritage Dictionary of the English Language, 5th Edition
 -  
From Latin frater (“brother”) + caedere (“to kill”). Equivalent to + -cide.
From Wiktionary
 
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