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abacus
 
Noun abacus has 2 senses
  1. abacus - a tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave
    --1 is a kind of     tablet
  2. abacus - a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves
    --2 is a kind of     calculator, calculating machine
aba cloth aba transit number ababdone abac abaca abacinate aback abactinal abacus abad abada abadan abadate abaddon abade abadon abadoned

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