Definitions for thumb index
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Random House Webster's College Dictionary
thumb′ in`dex(n.)
a series of labeled notches cut along the fore edge of a book, to indicate the divisions or sections.
Category: Printing
Origin of thumb index:
1900–05
thumb′-in`dex(v.t.)
Princeton's WordNet
thumb index(noun)
one of a series of rounded notches in the fore edge of a book to indicate sections
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"thumb index." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/thumb index>.