tresayle

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CIDE DICTIONARY

tresayle, n. [F. trisaïeul, from L. tris, tres, three + F. aïeul grandfather. Cf. Besaiel, and see Ayle.].

A grandfather's grandfather. [1913 Webster]

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.