transcription, транскрипция: [ ˈpȯr-fə-rən ]
noun
Etymology: International Scientific Vocabulary, from Greek porphyra purple
Date: 1910
: any of various compounds with a macrocyclic 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 exhibiting biological activity