sporopollenin

noun
spo·​ro·​pol·​len·​in | \ˌspȯr-ə-ˈpä-lə-nən \

Definition of sporopollenin 

: a relatively chemically inert polymer that makes up the outer layer of pollen grains and some spores

First Known Use of sporopollenin

1931, in the meaning defined above

History and Etymology for sporopollenin

International Scientific Vocabulary spor- + pollen + -in entry 1

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The first known use of sporopollenin was in 1931

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Britannica.com: Encyclopedia article about sporopollenin

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