ashlar

/ˈæʃlər/
noun
  1. A large, square-cut stone used in building, typically with smooth faces.
    • The castle walls were built with gray ashlar blocks.
    • The mason carefully placed each ashlar to create a straight wall.
    • They used ashlar for the front of the new library to give it a classic look.
  2. Masonry made of such stones, often laid in regular courses.
    • Ashlar is more expensive than rubble masonry because it requires skilled cutting.
    • The old church features beautiful ashlar on its exterior.
    • The building's ashlar was so precisely fitted that no mortar was visible.
Synonyms
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