step index

noun

Definition of step index

: an index cut into the fore edge of a book in the form of steps with the edge of each set of leaves preceding an indexed leaf being cut away — compare tab index, thumb index

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“Step index.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/step%20index. Accessed 14 Apr. 2021.

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