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Napier's bones definitions

WordNet (r) 3.0 (2005)

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]

Merriam Webster's

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

Webster's 1913 Dictionary

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.



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