abacus
nounmasculine/ɐˈβaku/medium
á·ba·co
Definition
An ancient calculating tool consisting of a frame with rods on which beads are moved.
The merchant used an abacus to calculate the price.
Learning to use an abacus can improve mental arithmetic.
Common collocations
Roman abacusbeads of an abacus
Etymology
Do latim 'abacus', do grego 'ábax'.