porphin

[ pôrfĭn ]

n.

The unsubstituted heterocyclic ring consisting of four pyrrole rings; it is the basic unit of the porphyrins.

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CAN YOU ACE THIS QUIZ ABOUT “COMPLIMENT” VS. “COMPLEMENT”?

Take this quiz to see if you really know the difference between “compliment” and “complement"!
Question 1 of 11
“Compliment” and “complement” had a shared meaning a long time ago, but today they are no longer interchangeable.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.