noun, plural ab·a·cus·es, ab·a·ci [ab-uh-sahy, -kahy, uh-bak-ahy] /ˈæb əˌsaɪ, -ˌkaɪ, əˈbæk aɪ/.
Origin of abacus
Examples from the Web for abacus
Thus, Goldman found them a willing buyer for the junk piled into Abacus.
But Abacus and similar deals were already sucking money out of Rhineland, according to a person familiar with the matter.
So the abacus held the field for a long time, even against the new algorism employing the new numerals.
The steeper the slope of the bell, the thinner may be the abacus.The Stones of Venice, Volume I (of 3)|John Ruskin
This, as pictured in the text, is the common Gerbert abacus.
The abacus, nearly six inches deep, has a flat upper part on which a continuous diaper of Greek crosses has been cut.Bell's Cathedrals: Chichester (1901)|Hubert C. Corlette
The projection of the echinus beyond the fillet of the abacus should be equal to the size of the eye.Ten Books on Architecture|Vitruvius