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See more synonyms for polyolefin on Thesaurus.com
noun Chemistry.
  1. any of a group of thermoplastic, stiff, light, and hard polymers obtained from the polymerization of simple olefins like propylene, used for injection molding, mostly in the automotive and appliance industries.
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Origin of polyolefin

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018