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Definition of: abacus
Our photo definition of abacus 
(ab′ə·kəs) noun plural cus·es or ·ci (·sī)
1. An ancient calculating device with counters sliding on wires or in grooves.
2. Archit. A slab forming the top of a capital. For illustration see CAPITAL. [<L <Gk. abax counting table]
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