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Paper dictionaries often have cut-outs in the pages that make it easier to turn to (words beginning with) each letter. Here's a picture:

Dictionary with notched edge

I know there's a name for these things but I can't remember what it is and it's remarkably hard to search for information about dictionaries — the search engines insist on bringing up dictionary definitions of the keywords you try. Anyone know the word?

Chenmunka
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zwol
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3 Answers3

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Index Notches.

How to make Index Notches

And here's a patent for a device to cut index notches.

Davo
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Wikipedia calls this a thumb index. It is also frequently used with bibles for quickly finding each book.

EDIT: To clarify, this refers to the whole set of notches. The individual notches can be called thumb tabs (as given by Chris H in the comments), index notches (as given in Davo's answer), or thumb notches.

SteveES
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For the want of a special word I would call them "tabs'. To distinguish them from the tabs on files perhaps we could name them as "index tabs".

  • Definitely NOT 'Tabs' Reason: Tabs 'stick out' and that name is used in so many different areas, each meaning something that sticks out. In Organ Technology, for instance, many modern consoles (keyboards) have 'Tab' stops - they stick out. So the cut-away indexing in a dictionary or Bible is simply that - it's cut away and reveals the letter at the beginning of a section or, Bible - it's cut away to reveal the name of one of the Books at its beginning. – Michael Gamble Feb 03 '20 at 18:27