Meaning of ABACUS in English

ABACUS

noun (plural abaci or ~es) Etymology: Latin, from Greek abak-, abax, literally, slab Date: 14th century an instrument for performing calculations by sliding counters along rods or in grooves, a slab that forms the uppermost member or division of the capital of a column

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.