A prefix meaning large. A macromolecule is a high molecular weight polymeric molecule such as a protein, carbohydrate, or nucleic acid. Their diameter is typically between 10−8 and 10−6 m. Natural and synthetic polymers such as cotton and plastics are also examples of macromolecules. A macroporous resin is a type of ion exchange resin that has an open pore structure capable of absorbing large ions. The rate of absorption of ions and resistance to osmotic shock is better than for gel-type resins, although their overall capacity is lower. Something that is macroscopic is large enough to be visible to the naked eye.