Tresayle /(trĕs"āl`)/

Tres·ayle

Tresayle

n.
  1. A grandfather's grandfather. [Obs.]

Phrases & Compounds
Writ of tresayle
a writ which lay for a man claiming as heir to his grandfather's grandfather, to recover lands of which he had been deprived by an abatement happening on the ancestor's death.