What is the name for a substance that delays or prevents blood coagulation?

The term that describes a substance that delays or prevents blood coagulation is "anticoagulant." Anticoagulants function by interfering with the blood clotting process, which is crucial for preventing unnecessary clots that can lead to conditions such as thrombosis or stroke. In medical practice, anticoagulants are often used to treat or prevent thromboembolic disorders and are an essential aspect of managing patients at risk for blood clots.

Other terms provided do not relate to blood coagulation. Antispasmodics are medications used to relieve spasms, usually in the gastrointestinal or urinary tract. Aphagia refers to the inability to swallow, often due to a medical condition affecting the ability to do so. Anxiety, while a condition that can affect overall health, does not have a direct relationship with blood coagulation. Understanding these definitions helps clarify why "anticoagulant" is the appropriate choice for this context.