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Definitions of abacus:

noun: a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves
noun: a tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave

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Alternative Terms
crossbeam bead times-topics-calculators acxiom-corporation experian-americas harte-hanks-inc biquinary-code hindu-arabic-numerals abacus-architecture hindu-arabic-numeral-system china3 japan africa babylonia 24th-century-bc la-india mesopotamia egypt bi-quinary-coded-decimal sexagesimal middle-english latin greek-language genitival semitic-languages root-linguistics hebrew-language phoenician-language ancient-egypt herodotus salamis-island roman-abacus calculus jeton roman-numerals 1st-century 5th-century suanpan han-dynasty decimal hexadecimal hardwood multiplication division-mathematics addition subtraction square-root cube-root zhang-zeduan 1085 1145 song-dynasty 960 1297 apothecary roman-empire abacus counting-rods 0-number tang-dynasty indian-ocean middle-east islam-name soroban korean-peninsula 15th-century quipu tally-sticks quechua-wordnet fibonacci-number commonwealth-of-independent-states numeral-system arithmetic blindness nemeth-braille encyclop-dia-britannica-3 crc-press chisanbop sand-table cut-the-knot fossil-abacus-wrist-pda chinese-mini-abacus schwanpan tailloir plinthus swanpan spanish-order abacist biquinary-abacus super-abacus abaciscus epistyle coussinet fleuron-2 helix

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