Submitted by György Chityil ... on Sat, 01/20/2018 - 01:10 Hierarchy: NounDescription: {{enzyme}} A protease that converts prothrombin to thrombin during the clotting of bloodNgram: thromboplastinNgram Text: thromboplastinSource: WiktionaryIssue: 0Wiktionary tag: enzymeNgram Count: 1