In architecture, an abacus (from the Ancient Greek ἄβαξ (ábax), 'slab'; or French abaque, tailloir; pl.: abacuses or abaci) is a flat slab forming the uppermost member or division of the capital of a column, above the bell. Its chief function is to provide a large supporting surface, tending to be wider than the capital, as an abutment to receive the weight of the arch or the architrave above.
In architecture, an abacus (from the Ancient Greek ἄβαξ (ábax), 'slab'; or French abaque, tailloir; pl.: abacuses or abaci) is a flat slab forming the uppermost member or division of the capital of a column, above the bell. Its chief function is to provide a large supporting surface, tending to be wider than the capital, as an abutment to receive the weight of the arch or the architrave above.
Source: Wikipedia "Abacus (architecture)" · CC BY-SA 4.0
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