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A series of rounded indentations cut into the front edge of a book, each labeled, as with a letter, to indicate a section of the book.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Printing, Lithography & Bookbinding) a series of indentations cut into the fore edge of a book to facilitate quick reference
(Printing, Lithography & Bookbinding) (tr) to furnish with a thumb index
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a series of labeled notches cut along the fore edge of a book, to indicate the divisions or sections.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||thumb index - one of a series of rounded notches in the fore edge of a book to indicate sections|
notch - a V-shaped or U-shaped indentation carved or scratched into a surface; "there were four notches in the handle of his revolver"
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