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sporopollenin

[spawr-uh-pol-uh-nin]
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noun
  1. an inert, tough polymer forming the resistant outer coat of a pollen grain or spore.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
sporopollenin in Science

sporopollenin

[spôr′ə-pŏl′ə-nĭn]
  1. An organic polymer that is extremely resistant to degradation. Pollen grains and many kinds of spores have a protective outer coating of sporopollenin, which is so durable that microfossils of sporopollenin are found in rocks over 500 million years old.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.