What is "killukin"

Killukin or Killucan a parish in the barony of Boyle, County Roscommon, and Province of Connacht, on the road from Carrick-on-Shannon to Ballina containing, with part of the market and post town of Carrick (with which it is connected by a bridge over the River Shannon) it is bound on the north by the parish of Toomna on the west, partly by the parish of Eastersnow, and partly by that of Ardcarne on the south by the Parish of Killummond and on the east by the river Shannon.