Plasma Thromboplastin Antecedent, also known as Factor XI, is a protein that plays a crucial role in the blood clotting process. However, sometimes it becomes necessary to use synonyms for such scientific terms while writing academic papers or articles. Some synonyms for Plasma Thromboplastin Antecedent include Factor XI, Antecedent Hemophilia C, and Plasma Thromboplastic Component. In simpler terms, it can also be referred to as a blood-clotting factor. Factors X and IX are other blood-clotting proteins that work in conjunction with Factor XI to activate the coagulation process. Knowing these synonyms can help you write more concise and clear research papers in the field of hematology.