{ 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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.