From Longman Dictionary of Contemporary EnglishRelated topics: Plasticspolypropylenepol‧y‧pro‧py‧lene /ˌpɒlɪˈprəʊpəliːn $ ˌpɑːliˈproʊ-/ noun [uncountable]HCPa hard light plastic materialExamples from the Corpuspolypropylene• BrackenTwist is a stunning new Tufted range of 12 colours, manufactured in 50% wool, 50% polypropylene.• Netting is likely to be made from either polypropylene or polythene.• The oil tank is made from polypropylene and is not part of the main frame.• How powerful is polypropylenereinforcedcement?• Neste Chemicals has developed a new polypropylenegrade with an extremely high degree of clarity.• The PlaqueAttacker is made of polypropylene - a strong flexiblesubstance which is inert.• Boxes are available made of clear polycarbonate, opaquepolypropylene or metal.• It is usually associated with rows of back-to-back closed binning or open shelving with steel or polypropylene tote-boxes.Originpolypropylene(1900-2000)poly- + propylene type of gas ((19-21 centuries))