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thumb index
thumb in·dex (plural thumb in·dex·es or thumb in·di·ces)


noun 
Definition:
 
grooves in edge of book: a series of labeled indentations cut into the pages of a book down the edge opposite the binding to allow a particular section to be located quickly

thumb-in·dex transitive verb
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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