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Napier's bones

noun, (used with a singular verb) Mathematics.
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 of Napier's bones
First recorded in 1650-60; after their developer, J. Napier Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for Napier's bones

Napier's bones

plural noun
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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