anticoagulant

n. substance that prevents clotting, substance that prevents coagulation (Medicine)

An anticoagulant is a substance that prevents coagulation; that is, it stops blood from clotting. A group of pharmaceuticals called anticoagulants can be used in vivo as a medication for thrombotic disorders. Some chemical compounds are used in medical equipment, such as test tubes, blood transfusion bags, and renal dialysis equipment. They also have military applications, whereby their introduction into the wounds of enemy soldiers will make their treatment significantly more difficult.
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Anticoagulant /an·ti·co·ag·u·lant/ acting to suppress, delay, or nullify blood coagulation, or an agent that does this. [more]Anticoagulant - Community and Resources

Noun
1. medicine that prevents or retards the clotting of blood
(synonym) anticoagulant medication, decoagulant
(hypernym) medicine, medication, medicament, medicinal drug
(hyponym) dicumarol, dicoumarol

n. anticoagulate