FRATRICIDE
fratricide
(noun) the murder of your sibling
fratricide
(noun) a person who murders their brother or sister
Source: WordNet® 3.1
Etymology
Noun
fratricide (countable and uncountable, plural fratricides)
The killing of one's brother (or sister).
A person who commits this crime.
(military, by extension) The intentional or unintentional killing of a comrade in arms.
(military, by extension) The undesirable situation where the separate missiles from a MIRV interfere with each other as they explode.
Synonyms
• (person who commits fratricide): brother-slayer
Source: Wiktionary
Frat"ri*cide, n. Etym: [L. fratricidium a brother's murder, fr.
fratricida a brother's murderer; frater, fratris, brother + caedere
to kill: cf. F. fratricide.]
1. The act of one who murders or kills his own brother.
2. Etym: [L. fratricida: cf. F. fratricide.]
Definition: One who murders or kills his own brother.
Source: Webster’s Unabridged Dictionary 1913 Edition