grandsire noun4 •Any male ancestor. •The sire of a sire, paternal grandfather •Any of a number of methods of change-ringing on bells. •(no longer used) Grandfather.“I am going to a certain tower, one of three that were built in my grandsire’s time to guard Lantern Waste against certain perilous outlaws who dwelled there in his day. […]" — 1956 formsgrandsires
