ashlar

Origin

From Middle English assheler, acheler, etc., from forms of Old French esselier (“wooden support, traverse beam”), from Medieval Latin ascelāris and assellāris (equivalent to a diminutive of early forms of ais (“plank”)), variant of *axillāris (attested only after the Renaissance), from Latin axilla (“little plank”) + -āris (“-ary: forming adjectives”), from axis (“axle, plank”) + -illa (“-ella: forming diminutives”).