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| ab·a·cus [ ábbəkəss ] (plural ab·a·cus·es or ab·a·ci [ ábbə sī, ábbə kī ]) |
noun |
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1. counting device: a mechanical device for making calculations consisting of a frame mounted with rods along which beads or balls are moved
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2. flat top of column: a flat slab at the top of an architectural column
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| [14th century. Via Latin< Greek abakos "board strewn with dust on which to draw or write" (later "slab, table")] |
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