Napier's bones

noun
Na·pi·er's bones | \ˈnā-pē-ərz- \

Definition of Napier's bones 

: 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

First Known Use of Napier's bones

1646, in the meaning defined above

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The first known use of Napier's bones was in 1646

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