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Napier's bones

noun, Mathematics
1.
a form of multiplication table originally marked on sticks of bone or ivory that could be rearranged to carry out the operations of multiplication or division.
Also called Napier's rods.
Origin
1650-1660
1650-60; after their developer, J. Napier
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for napiers bones

Napier's bones

plural noun
1.
a set of graduated rods formerly used for multiplication and division
Word Origin
C17: based on a method invented by John Napier
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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