Submitted by György Chityil ... on Sat, 01/20/2018 - 01:15 Hierarchy: NounDescription: {{organic chemistry}} The chemical modification of a functional group with the aim of the reversal of polarity of that group.Ngram: umpolungNgram Text: umpolungSource: WiktionaryIssue: 0Wiktionary tag: organic chemistryNgram Count: 1