adjective Chemistry.
pertaining to or derived from a vinyl polymer.

1930–35; poly- + vinyl

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World English Dictionary
polyvinyl (ˌpɒlɪˈvaɪnɪl, -ˈvaɪnəl)
(modifier) designating a plastic or resin formed by polymerization of a vinyl derivative

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1933, formed in Eng. from poly(mer) + vinyl.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

polyvinyl pol·y·vi·nyl (pŏl'ē-vī'nəl)
Of, relating to, or characterizing a polymerized thermoplastic vinyl, such as polyvinyl chloride.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Recycling centers typically do not accept polyvinyl chloride for recycling.
The wiring loom uses recycled and halogen-free materials instead of polyvinyl,
  a move intended to make it more easily recycled.
The matter at hand was a proposal to ban the purchase of polyvinyl chloride
  products using city funds.
The gel is made by mixing powdered polyvinyl alcohol with acid in a mold.
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