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thumb index

noun
1.
a series of labeled notches cut along the fore edge of a book, to indicate the divisions or sections.
Origin
1900-1905
1900-05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for thumb indices

thumb index

noun
1.
a series of indentations cut into the fore edge of a book to facilitate quick reference
verb
2.
(transitive) to furnish with a thumb index
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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12
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