Definition of thumb notch
1
: a notch of a size to admit the tip of a thumb cut in the outer edges of the pages of a book for the insertion of index letters or headings — compare thumb index
2
: a half-moon cut in the sides of a slipcase to facilitate removal of the book
— called also thumb cut
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“Thumb notch.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thumb%20notch. Accessed 18 May. 2022.
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