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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Na·pi·er's bones Na·pi·er's rods. A set of rods, made of bone or other material, each divided into nine spaces, and containing the numbers of a column of the multiplication table; -- a contrivance of Baron Napier, the inventor of logarithms, for facilitating the operations of multiplication and division.
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From: WordNet (r) 2.0

 Napier's rods
      n : a set of graduated rods formerly used to do multiplication
          and division by a method invented by John Napier [syn: Napier's
           bones]