Submitted by György Chityil ... on Sat, 01/20/2018 - 00:52 Hierarchy: NounDescription: {{organic compound}} A pyrrolizidine alkaloid found in the common groundsel and comfrey.Ngram: retronecineNgram Text: retronecineSource: WiktionaryIssue: 0Wiktionary tag: organic compoundNgram Count: 1