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abacus

ab·a·cus

abacus

pronunciation:
ae b ks
features:
Word Explorer
part of speech: noun
inflections: abaci, abacuses
definition: a device used to make arithmetic calculations, consisting of a frame with parallel rods or grooves that hold movable counters such as beads.
The shopkeeper used an abacus to add up our purchases.
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See
  mathematics, tool