Dictionary

thumb index

noun

: a series of small cuts in the edge of the pages in a large book that are labeled and that make it easier to open the book to a particular section

Full Definition of THUMB INDEX

:  a series of usually labeled notches cut in the fore edge of a book (as a dictionary) to facilitate reference

Examples of THUMB INDEX

  1. a dictionary that has a thumb index

First Known Use of THUMB INDEX

1903

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