sorosis
A women's club; a society to further the educational and social activities of women.
historical
Yet these women were not a clique, nor a sect, nor a Sorosis, but all our wives, and sisters, and daughters, and lovers. They were just the common lot […]
Where it comes from
According to Webster Suppl. 1879, an arbitrary use of the botanical term, adopted as the name of the first club of the kind, founded in 1868. It follows that it shares the same etymology, referring to aggregation, rather than the etymology of sorority, which referred to sisterhood.
Adapted from the Wiktionary entry sorosis (CC BY-SA 4.0).