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thumb-index

[thuhm-in-deks]
verb (used with object)
  1. to provide (a book) with a thumb index.
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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.
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Origin of thumb index

First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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
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verb thumb-index
  1. (tr) to furnish with a thumb index
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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