Submitted by György Chityil ... on Fri, 01/19/2018 - 22:00 Hierarchy: NounDescription: {{astronomy}} A star which is cooling and contracting to become a neutron star.Ngram: protoneutron starNgram Text: protoneutron starSource: WiktionaryIssue: 0Wiktionary tag: astronomyNgram Count: 2
