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Napier's bones definitions
n 1: a set of graduated rods formerly used to do multiplication and division by a method invented by John Napier [syn: Napier's bones, Napier's rods]
noun Date: circa 1658 a set of graduated rods (as of wood or bone) invented by John Napier and used for multiplication and division based on the principles of logarithms
Napier's bones Na"pi*er's bones`, Napier's rods 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.

