In particular, a billion is 10 9 = 1 000 000 000 in the American system and 10 12 = 1 000 000 000 000 in the European system. For 10 9, Europeans say thousand million or milliard.. Although we describe the two systems today as American or European, both systems are actually of French origin.
Definition of warfarin. : a crystalline anticoagulant coumarin derivative C19H16O4 that inhibits the production of prothrombin by vitamin K and is used as a rodent poison and in medicine; also : its sodium salt C19H15NaO4 used especially in the prevention or treatment of thromboembolic disease.
A Brigham and Women's Hospital answered. Warfarin (Coumadin) is an anticoagulant or blood thinner.. Anti means against, and coagulant refers to blood clotting. An anticoagulant helps reduce the risk of clots forming in the blood. Warfarin treatment will be monitored through regular laboratory testing. The blood test is called a PT or protime and is reported as an INR which stands for International Normalized Ratio.