Abacus
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“A tray strewn with dust or sand, used in ancient times for calculating. A contrivance for calculating, consisting of beads or balls strung on wires or rods set in a frame."—Wright, 1902
Source
William Dwight Whitney, The Century Dictionary, an Encyclopedic Lexicon of the English Language (New York: The Century Co., 1902)I:3
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