Tres"ayle` (trĕs"āl`), n. [F.
trisaïeul, from L. tris, tres, three + F.
aïeul grandfather. Cf. Besaiel, and see Ayle.]
A grandfather's grandfather. [Obs.]
Writ of tresayle (O. Eng. Law), 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. Mozley & W.