grandsire

Etymology
From ; compare and.

Noun

 * 1) Grandfather.
 * 2) Any male ancestor.
 * 3) Any of a number of methods of change-ringing on bells.
 * 4)  The sire of a sire, paternal grandfather
 * 1)  The sire of a sire, paternal grandfather

Usage notes
In the equestrian sense, maternal grandfather is a (i.e. sire of a ), not a grandsire.