Submitted by György Chityil ... on Sat, 01/20/2018 - 01:20 Hierarchy: NounDescription: {{organic chemistry}} The univalent cation formed by protonating the oxygen atom of urea.Ngram: uroniumNgram Text: uroniumSource: WiktionaryIssue: 0Wiktionary tag: organic chemistryNgram Count: 1