- a series of indentations cut into the fore edge of a book to facilitate quick reference
- (transitive) to furnish with a thumb index
| 单词 | thumb index |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 thumb′ in′dex,
thumb-in•dex (thum′in′deks),USA pronunciation v.t.
Collins Concise English Dictionary © HarperCollins Publishers:: thumb index n
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