ashler
  [建築用的] 方石;方石堆
  Ash·lar, Ash·ler  n.
  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.
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