the GNU version of the Collaborative International Dictionary of English
n. The murder of one's sister; also, one who murders or kills one's own sister.
The Century Dictionary and Cyclopedia
n. One who kills his sister.
n. The murder of a sister.
Word Usage
"As she has already unseated Lisa's father Frank as Governor, this match-up would make for great political theater and Republican fratricide, or perhaps sororicide."