Submitted by György Chityil ... on Fri, 01/19/2018 - 23:54 Hierarchy: NounDescription: {{biochemistry}} any of several natural pigments having a structure of four pyrrole rings connected by a one-carbon unitNgram: tetrapyrroleNgram Text: tetrapyrroleSource: WiktionaryIssue: 0Wiktionary tag: biochemistryNgram Count: 1