procoagulant Syllabification: (pro·co·ag·u·lant)Pronunciation: /ˌprōkōˈagyələnt/ BiochemistryDefinition of procoagulant adjective relating to or denoting substances that promote the conversion in the blood of the inactive protein prothrombin to the clotting enzyme thrombin. noun a procoagulant substance. procoagulant in other Oxford dictionaries Definition of procoagulant in the British & World English dictionary