Answer: Abacus in architecture is a flat slab forming the uppermost member or division of the capital (building structure) of a column, above the bell. Its chief function is to provide a large supporting surface (wider than the capital) to receive the weight of the arch or the architrave above. The diminutive of Abacus, Abaculus, is used to describe small mosaic tiles, also called Abaciscus or Tessera, used to create ornamental floors with detailed patterns of chequers or squares in a tessellated pavement. It is derived from from the Greek word Abax, slab or French word Abaque, Tailloir; plural Abacuses or Abaci.
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