Definition of thumb index
: a series of usually labeled notches cut in the fore edge of a book (such as a dictionary) to facilitate reference
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“Thumb index.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thumb%20index. Accessed 28 Feb. 2021.
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Time Traveler for thumb index
The first known use of thumb index was in 1903
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