a tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave
a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves [also: abaci (pl)]
abacus Sentences in English
Once in a while, the numbers fall, the abacus clicks into a pattern.
Make an abacus and write a report about its usefulness in terms of place value and computation.
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