Main Entry: war·fa·rin

Pronunciation: \ˈwȯr-fə-rən\

Function: noun

: a crystalline anticoagulant coumarin derivative C₁₉H₁₆O₄ related to dicumarol 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—see coumadin