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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Examples of thumb index in a Sentence
a dictionary that has a thumb index
First Known Use of thumb index
1903
THUMB INDEX Defined for English Language Learners
thumb index
Definition of thumb index for English Language Learners
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: 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
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