Of or pertaining to a sister; sisterly.[From Latin soror (sister). Ultimately from Indo-European root swesor-(sister) that is also the source of words cousin and sister, and words for sister in other languages such as French soeur, German Schwester, and Dutch zuster.]
Fraternal is the male equivalent of this term.
Today's word in Visual Thesaurus 3 (New): http://visualthesaurus.com/?w1=sororal
"Today, the Williams sisters face off to decide which will advance to the women's finals of tennis's most famous tournament. Venus, 20, and Serena, 18, have publicly rejoiced in the sororal showdown."
Frank Ahrens; Sibling Scorekeeping: Will Tennis Match Be Love-All?; The Washington Post; Jul 6, 2000."Damiano creates several superb moments, among them a duet for Su-Feh Lee and Kathleen McDonagh in which the two dancers slowly embrace and release across a brilliant well of light. Each time they deliver a different version of female compassion: now maternal, now sororal, now carnal."
Michael Scott; Direct From the Margins, Three Bring Restless Inspiration to Mainstage; The Vancouver Sun (Canada); May 14, 1994.
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