|käprə+ noun
( -s )
Etymology: International Scientific Vocabulary copr- + porphyrin
: any of four isomeric porphyrins C 20 H 6 N 4 (CH 3 ) 4 (CH 2 CH 2 COOH) 4 of which types I and III are found in feces and urine especially in certain pathological conditions and also in yeast