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A binding consisting of a cylindrical spiral of wire or plastic that is passed through a row of punched holes at the edge of a notebook or booklet.
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) bookbinding a method of securing the pages of a publication by passing a coil of wire through small holes punched at the back edge of the covers and individual pages
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a notebook binding in which the pages are fastened together by a spiral of wire that coils through holes at the side of each page.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.