Submitted by György Chityil ... on Sat, 01/20/2018 - 01:15 Hierarchy: AdjectiveDescription: {{physics}} Of a temperature close to absolute zero, especially one at which quantum-mechanical properties are observed.Ngram: ultracoldNgram Text: ultracoldSource: WiktionaryIssue: 0Wiktionary tag: physicsNgram Count: 1