{ } n. [ OE. ascheler, achiler, OF. aiseler, fr. aiselle, dim. of ais plank, fr. L. axis, assis, plank, axle. See Axle. ] 1. (Masonry) (a) Hewn or squared stone; also, masonry made of squared or hewn stone. [ 1913 Webster ]

Rough ashlar, a block of freestone as brought from the quarry. When hammer-dressed it is known as common ashlar. Knight. [ 1913 Webster ]

(b) In the United States especially, a thin facing of squared and dressed stone upon a wall of rubble or brick. Knight. [ 1913 Webster ]