Chemistry. containing the vinyl group.
any resin formed by polymerization of compounds containing the vinyl group or plastics made from such resins.

1860–65; < Latin vīn(um) wine + -yl Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vinyl (ˈvaɪnɪl)
1.  (modifier) of, consisting of, or containing the monovalent group of atoms CH2CH-: a vinyl polymer; vinyl chloride
2.  (modifier) of, consisting of, or made of a vinyl resin: a vinyl raincoat
3.  any vinyl polymer, resin, or plastic, esp PVC
4.  (collectively) conventional records made of vinyl as opposed to compact discs
[C19: from vini- + -yl]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"plastic or synthetic resin," 1939, short for polyvinyl, not in widespread use until late 1950s. In chemistry, vinyl was used from 1863 as the name of a univalent radical derived from ethylene, from L. vinum "wine," because ethyl alcohol is the ordinary alcohol present in wine. Slang meaning "phonograph
record" (1976) replaced wax in that sense.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

vinyl vi·nyl (vī'nəl)
The univalent radical CH2-CH derived from ethylene.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
vinyl   (vī'nəl)  Pronunciation Key 
  1. The group C2H3, derived from ethylene.

  2. Any of various chemical compounds, typically highly reactive, that contain this group and are used in making plastics.

  3. Any of various plastics made of vinyl, typically tough, flexible, and shiny, often used in upholstery and clothing.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
IN some circles, putting vinyl siding on historic buildings is considered
  downright sinful.
The movement was made, of course, by the large covers of vinyl records.
Durable, easy-to-clean vinyl with adjustable volume.
Peel backing from vinyl letters and apply them to the pot within the circle.
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