Definitions from Wiktionary (abacus)

▸ noun:  (historical, obsolete) A table or tray scattered with sand which was used for calculating or drawing.
▸ noun:  A device used for performing arithmetical calculations; (rare) a table on which loose counters are placed, or (more commonly) an instrument with beads sliding on rods, or counters in grooves, with one row of beads or counters representing units, the next tens, etc.
▸ noun:  (architecture) The uppermost portion of the capital of a column immediately under the architrave, in some cases a flat oblong or square slab, in others more decorated.
▸ noun:  (Ancient Greece, Ancient Rome, historical) A board, tray, or table, divided into perforated compartments for holding bottles, cups, or the like; a kind of buffet, cupboard, or sideboard.
▸ Also see abacus




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