thumb indices

thumb index

noun
a series of labeled notches cut along the fore edge of a book, to indicate the divisions or sections.

Origin:
1900–05

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thumb index
 
n
1.  a series of indentations cut into the fore edge of a book to facilitate quick reference
 
vb
2.  (tr) to furnish with a thumb index

Collins English Dictionary - Complete & Unabridged 10th Edition
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