Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Latin
Origin: Greek abax 'flat piece of stone'

abacus

 noun
     
abacus
Related topics: Maths
ab‧a‧cus [countable]
HM a frame with small balls that can be slid along on thick wires, used for counting and calculating
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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