napier's bones

Noun
  1. A set of graduated rods formerly used to do multiplication and division by a method invented by John Napier (synset 103812874)
    domain usage: plural, plural form - the form of a word that is used to denote more than one
    is a type of: calculating machine, calculator - a small machine that is used for mathematical calculations; can be mechanical or electronic
    same as: napier's rods

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