This word is acceptable for play in the UK dictionary that is being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of or pertaining to sororicide, the killing of one's sister.

"A quite unpremeditated inspiration which occurred to me upon being again offended -- to run away -- probably alarmed my parents more than my sororicidal projects, and I think determined them upon carrying out a plan which had been talked of for some time, of my being sent again to school; which plan ran a narrow risk of being defeated by my own attempted escape from home."