Napier's Bones Definition
nāpē-ərz, nə-pîrz
noun
A set of graduated rods used to perform multiplication quickly.
American Heritage
(arithmetic) A set of numbered rods used for multiplication and division (see the Wikipedia article for a fuller explanation).
Wiktionary
Origin of Napier's Bones
After John Napier
From American Heritage Dictionary of the English Language, 5th Edition
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