Napier's bones

/ˌneɪpiərz ˈboʊnz/
IPA guide

Definitions of Napier's bones
  1. noun
    a set of graduated rods formerly used to do multiplication and division by a method invented by John Napier
    synonyms: Napier's rods
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    type of:
    calculating machine, calculator
    a small machine that is used for mathematical calculations
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