- The cyclic system of four pyrrole rings forming the central structure of the vitamin B12 and related compounds.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for corrin
Corrin buckled first, insisting that Harris sleep on a sofa, then moving out.A ‘Truman Show’ For Today: The Return of Josh Harris
July 11, 2014