porphyrin

noun
por·phy·rin | \ˈpȯr-fə-rən \

Definition of porphyrin 

: any of various compounds with a macrocyclic structure that consists essentially of four pyrrole rings joined by four =CH− groups especially : one (such as chlorophyll or hemoglobin) containing a central metal atom and usually exhibiting biological activity

First Known Use of porphyrin

1910, in the meaning defined above

History and Etymology for porphyrin

International Scientific Vocabulary, from Greek porphyra purple

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The first known use of porphyrin was in 1910

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porphyrin

noun
por·phy·rin | \ˈpȯr-fə-rən \

Medical Definition of porphyrin 

: any of various compounds with a structure that consists essentially of four pyrrole rings joined by four =CH− groups especially : one (as chlorophyll or hemoglobin) containing a central metal atom and usually having biological activity

More from Merriam-Webster on porphyrin

Britannica.com: Encyclopedia article about porphyrin

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