Also called slide fastener. a device used for fastening clothing, valises, etc., consisting of two toothed tracks or spiral metal or plastic coils, each bordering one of two edges to be joined, and a piece that either interlocks or separates them when pulled.
a person or thing that zips.
a rubber and fabric boot or overshoe fastened up the leg by a zipper.
a large illuminated display of news bulletins or advertisements that rapidly and continously flash by on an upper part of a building.
verb (used with object), verb (used without object)

1920–25, Americanism; formerly a trademark; see zip1, -er1

zipperless, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
zipper (ˈzɪpə)
(US), (Canadian) Also called (in Britain and certain other countries): zip a fastening device operating by means of two parallel rows of metal or plastic teeth on either side of a closure that are interlocked by a sliding tab

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1925, probably from zip (1). The trademark taken out on the name that year applied to a boot with zippers, not to the "lightning fastener" itself, which was at first called a zip.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Wrap the mattress in canvas and put a zipper down one side and along the bottom.
Outboard from the waterproof compartment is the laptop sleeve, which you access
  via a urethane-coated, heavy-duty side zipper.
Ideally you want the whitewater to scroll across the wave sequentially, evenly,
  the way a zipper unzips.
Crisp calls its falafels handbag sandwiches for their eco-paper packaging,
  complete with clever zipper waists.
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