pol·y·pro·pyl·ene 
(pŏl′ē-prōpə-lēn′)
(pŏl′ē-prōpə-lēn′)n.
1. Any of various thermoplastic polymers of propylene. They are hard and tough, and are used to make molded articles and fibers.
2. A fabric of fibers made from any of these polymers.
pol′y·propyl·ene′ adj.