\Ash"lar\, Ashler \Ash"ler\, 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.
             Rough ashlar, a block of freestone as brought
             from the quarry. When hammer-dressed it is known
             as common ashlar.                 --Knight.
   (b) In the United States especially, a thin facing of
       squared and dressed stone upon a wall of rubble or
       brick. --Knight.