Definify.com
Webster 1913 Edition
Sororicide
So-ror′i-cide
(?; 277)
, Noun.
[L.
sororocida
, and sororicidium
; soror
a sister + caedere
to kill.] The murder of one’s sister; also, one who murders or kills one's own sister.
Johnson.
Webster 1828 Edition
Sororicide
SOROR'ICIDE
,Noun.