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thumb index. In DICTIOUS you will not only get to know all the dictionary meanings for the word
thumb index, but we will also tell you about its etymology, its characteristics and you will know how to say
thumb index in singular and plural. Everything you need to know about the word
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English
Noun
thumb index (plural thumb indexes)
- A series of alphabetically marked or otherwise labelled semicircular cut-outs in the fore edge of a large reference book, encyclopaedia, Bible, etc., that allows quick access to various parts of the text.