siosma
Definitions (by source)
‘schism’; dat. pl. siosmaibh 25.17-18
Aibidil Gaoidheilge & Caiticiosma: Seaán Ó Cearnaigh's Irish primer of religion, published in 1571. Editor: Brian Ó Cuív.
m., schism, quarrel, 2937
Trí Bior-Ghaoithe an Bháis: The Three Shafts of Death. Editor: Osborn Bergin.