grand- + sire
grandsire (plural grandsires)
- 1956, C. S. Lewis, The Last Battle, Collins, 1998, Chapter 5,
- “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. […] "
- Any male ancestor.
- Any of a number of methods of change-ringing on bells.
- (equestrian) The sire of a sire, paternal grandfather
In the equestrian sense, maternal grandfather is a damsire (i.e. sire of a dam), not a grandsire.