Submitted by György Chityil ... on Fri, 01/19/2018 - 23:54 Hierarchy: NounDescription: {{organic compound}} A polycyclic aromatic hydrocarbon; the acene containing five fused rings.Ngram: pentaceneNgram Text: pentaceneSource: WiktionaryIssue: 0Wiktionary tag: organic compoundNgram Count: 1