Napier's bones

noun 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.

1650–60; after their developer, J. Napier Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To napiers-rods
World English Dictionary
Napier's bones
pl n
a set of graduated rods formerly used for multiplication and division
[C17: based on a method invented by John Napier]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature