abacus

Noun
  1. A tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave (synset 102668977)
    is a type of: tablet - a slab of stone or wood suitable for bearing an inscription
  2. A calculator that performs arithmetic functions by manually sliding counters on rods or in grooves (synset 102668826)
    is a type of: calculating machine, calculator - a small machine that is used for mathematical calculations; can be mechanical or electronic

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