A squared stone or block used in building, or masonry made from such stones.
From Old French 'aiselier' (planed wood or squared stone), from 'ais' (board). The term traveled through French from Latin origins, describing precisely cut building material.
Ashlar masonry is the building technique that made those perfectly fitted stone castles and cathedrals possible—medieval masons shaped stones so precisely that mortar could barely fit between them, and they last 1,000 years.
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