Abacus

1. n. A board, tray, or table, divided into perforated compartments, for holding cups, bottles, or the like; a kind of cupboard, buffet, or sideboard.
2. n. A table or tray strewn with sand, anciently used for drawing, calculating, etc.
3. n. 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.
4. n. The uppermost member or division of the capital of a column, immediately under the architrave. See Column.
5. n. A tablet, panel, or compartment in ornamented or mosaic work.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.