Abacus /(ăb"ȧ*kŭs)/

pl. Abacuses, Abaci ((-sī))

1. A table or tray strewn with sand, anciently used for drawing, calculating, etc. [Obs.]
2. A calculating table or frame; an instrument for performing arithmetical calculations by balls sliding on wires, or counters in grooves, the lowest line representing units, the second line, tens, etc. It is still employed in China.
3. The uppermost member or division of the capital of a column, immediately under the architrave. See Column. (Arch.)
4. A board, tray, or table, divided into perforated compartments, for holding cups, bottles, or the like; a kind of cupboard, buffet, or sideboard.