ashlar

noun3

1. •
   Masonry employing flat and well-squared stone or brick, creating an appearance similar to wooden flooring.

   • The four main spans across the waterway are carried on ashlar piers founded on Memel timber piles. — 1949
2. •
   Stone hewn and finished to create such masonry, either completely or as a facade over an earthen or rubble core.
3. •
   (historical) A stone intended for hurling by means of a catapult or similar device.