dúthrachd Definitions (by source) Show all An Teagasg Críosdaidhe devotion, 1172; aid. dúthrachdach: go d., fervently, 1238, 1339. An Teagasg Críosdaidhe. Author: Bonabhentura Ó hEodhasa, O.F.M.. Editor: Fearghal Mac Raghnaill, O.F.M.