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Noun: abacus (abacuses,abaci)  u'ba-kus or a-bu-kus [N. Amer], a-bu-kus [Brit]
  1. A tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave
     
  2. A calculator that performs arithmetic functions by manually sliding counters on rods or in grooves

Derived forms: abaci, abacuses

Type of: calculating machine, calculator, tablet

Encyclopedia: Abacus