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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 of thumb index
1900-1905
1900-05

thumb-index

[thuhm-in-deks] /ˈθʌmˌɪn dɛks/
verb (used with object)
1.
to provide (a book) with a thumb index.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for thumb index

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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Difficulty index for thumb index

Few English speakers likely know this word

Word Value for thumb

12
14
Scrabble Words With Friends

Nearby words for thumb index
http://dictionary.reference.com/browse/thumb%20index
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