thumb index: meaning, definition, pronunciation and examples
C1formal, technical, publishing
Quick answer
What does “thumb index” mean?
A series of labelled notches or cut-outs on the edge of the pages of a book, especially a reference book, allowing a user to quickly locate a specific section by thumbing through them.
Audio
Pronunciation
Definition
Meaning and Definition
A series of labelled notches or cut-outs on the edge of the pages of a book, especially a reference book, allowing a user to quickly locate a specific section by thumbing through them.
A physical or digital navigation aid in book design that uses visual or tactile markers for rapid section access; metaphorically, any system that allows quick, manual scanning to find information.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. The term is equally understood and used in both varieties.
Connotations
Connotes practicality, quick reference, and a degree of quality in bookbinding. It suggests a well-produced reference work.
Frequency
Low-frequency term in both varieties, used almost exclusively in contexts discussing book design, publishing, or physical dictionaries/encyclopedias.
Grammar
How to Use “thumb index” in a Sentence
The [NOUN] has a thumb index.Find [NOUN] using the thumb index.The thumb index is marked with [LETTERS/SECTIONS].Vocabulary
Collocations
Examples
Examples of “thumb index” in a Sentence
adjective
British English
- The thumb-indexed dictionary was easier to use.
- A thumb-index volume is more expensive to produce.
American English
- The thumb-indexed reference book was more practical.
- Thumb-index editions are common for legal texts.
Usage
Meaning in Context
Business
Used in the context of producing high-quality corporate reports or reference manuals.
Academic
Found in discussions of book history, publishing, or library science.
Everyday
Rare. Might be mentioned when discussing a physical dictionary or encyclopedia.
Technical
Standard term in printing, bookbinding, and publishing industries.
Vocabulary
Synonyms of “thumb index”
Strong
Neutral
Weak
Vocabulary
Antonyms of “thumb index”
Watch out
Common Mistakes When Using “thumb index”
- Using it to refer to a standard index at the back of a book (which is just an 'index').
- Misspelling as 'thumb indecks' or 'thump index'.
- Using it as a verb (e.g., 'I thumb-indexed the book' is non-standard).
FAQ
Frequently Asked Questions
Not literally, as it is a physical feature. However, the concept is metaphorically applied to digital 'A-Z' sidebars or quick-jump menus in some apps.
An 'index' is typically a list at the back of a book. A 'thumb index' is a series of notches on the page edges, allowing you to open directly to a major section.
Technically yes, but it is a specialised binding process usually reserved for thick reference works like dictionaries, legal texts, or encyclopedias where quick section access is valuable.
Very close. 'Thumb tab' often refers to a single protruding tab, while 'thumb index' implies a series of cut-outs for multiple sections (e.g., A-Z). They are often used interchangeably.
A series of labelled notches or cut-outs on the edge of the pages of a book, especially a reference book, allowing a user to quickly locate a specific section by thumbing through them.
Thumb index is usually formal, technical, publishing in register.
Thumb index: in British English it is pronounced /ˈθʌm ˌɪn.deks/, and in American English it is pronounced /ˈθʌm ˌɪn.deks/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[No common idioms specific to this term]”
Learning
Memory Aids
Mnemonic
Imagine using your THUMB to quickly INDEX (find) a section in a book. The word itself describes the action: you use your thumb on the index.
Conceptual Metaphor
A BOOK IS A TERRITORY, and the thumb index is a MAP ON THE BORDER.
Practice
Quiz
What is the primary function of a thumb index?