polymerized propylene, a very light, highly resistant, thermoplastic resin used to make coatings, plastic pipe, packaging material, fibers for clothing fabrics, etc.
Origin of polypropylenepoly(mer) + propylene
- Any of various thermoplastic polymers of propylene. They are hard and tough, and are used to make molded articles and fibers.
- A fabric of fibers made from any of these polymers.