aidhbhseach
Definitions (by source)
great, mighty, 1797
Poems on the O'Reillys. Editor: James Carney.
tremendous, vast; dreadful; 2050 (desire); 3146 (exploit); 3551 (depth); compar. –sighe, 2091
Trí Bior-Ghaoithe an Bháis: The Three Shafts of Death. Editor: Osborn Bergin.