piséog Definitions (by source) Show all An Teagasg Críosdaidhe charm, spell, ái. -a, sorcery, witchcraft, 1749. An Teagasg Críosdaidhe. Author: Bonabhentura Ó hEodhasa, O.F.M.. Editor: Fearghal Mac Raghnaill, O.F.M.