A set of lettered grooves cut down the side of a book, especially a diary, address book, or dictionary, for easy reference.
- 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.
- 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.
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