Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun abacus

2 senses of abacus

Sense 1
abacus -- (a tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave)
       => tablet -- (a slab of stone or wood suitable for bearing an inscription)

Sense 2
abacus -- (a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves)
       => calculator, calculating machine -- (a small machine that is used for mathematical calculations)