To reverse or prevent coagulation; to break up a blood clot or prevent blood from clotting.
From de- 'reverse' plus coagulate (from Latin coagulare, from co- 'together' and agere 'to drive/cause'). Formed as a medical term in the 20th century.
Anticoagulants like warfarin are decoagulating drugs—they literally prevent your blood from forming clots. Understanding decoagulation saved millions of lives from strokes and heart attacks, yet we usually just say 'blood thinner.'
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