foslogadh Definitions (by source) Show all Trí Bior-Ghaoithe an Bháis: The Three Shafts of Death 3586 [m., act of opening, 3589. See osgladh], 3586. See fosgladh. Trí Bior-Ghaoithe an Bháis: The Three Shafts of Death. Author: Geoffrey Keating. Editor: Osborn Bergin.