Definition of thumb index in English:

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thumb index

Pronunciation: /THəm ˈinˌdeks/

noun

A set of lettered or marked grooves cut down the side of a book, especially a diary or dictionary, for easy reference.
Example sentences
  • One of the key design elements of the brochure is the series of thumb indexes along the face of the book.
  • Kent's volume is a good size for students starting out in homeopathy and has a thumb index for added ease of use.
  • Color-coded main topic sections serve as thumb indexes and are coordinated to match the table of contents, making the sections very quick and easy to find.

Derivatives

thumb-indexed

adjective
Example sentences
  • It is a vintage 1958 King James Version, gold-leafed, thumb-indexed and equipped with an extensive directory of useful topics.
  • The book is also thumb-indexed, which is nice, but I don't necessarily need it.
  • In grade school, I used an old thumb-indexed concise dictionary that was spiral bound.

For editors and proofreaders

Syllabification: thumb in·dex

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