Thumb index

A dictionary with thumb indexes (on the right).

A thumb index, also called a cut-in index,[1] is a round cut-out in the pages of dictionaries, encyclopedias, or other sectioned, often alphabetic, reference works like Bibles, used to locate entries starting at a particular letter or section. The individual notches are called thumb cuts.


  1. "thumb index". Bookbinding and the Conservation of Books: A Dictionary of Descriptive Terminology. Foundation of the American Institute for Conservation. Retrieved 8 May 2012.

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