/ab"euh keuhs, euh bak"euhs/ , n. , pl. abacuses, abaci /ab"euh suy', -kuy', euh bak"uy/ .
1. a device for making arithmetic calculations, consisting of a frame set with rods on which balls or beads are moved.
2. Archit. a slab forming the top of the capital of a column. See diag. under column .
[ 1350-1400; ME ábax ]