Submitted by György Chityil ... on Fri, 01/19/2018 - 22:05 Hierarchy: NounDescription: {{context|chemistry|used in combination}} having two atoms of oxygen in the moleculeNgram: dioxygenNgram Text: dioxygenSource: WiktionaryIssue: 0Wiktionary tag: chemistryused in combinationNgram Count: 1