sporopollenin
/ˌspɔrəˈpɑlənɪn/
noun
- A very tough, resistant organic substance that forms the outer layer of pollen grains and spores, helping them survive harsh conditions.
- Because of sporopollenin, pollen can be preserved in fossils for millions of years.
- The outer wall of a pollen grain is made mostly of sporopollenin.
- Sporopollenin is one of the most durable natural materials on Earth.