Definition of warfarin noun from the Oxford Advanced Learner's Dictionary

 

warfarin

 noun
noun
BrE BrE//ˈwɔːfərɪn//
 
; NAmE NAmE//ˈwɔːrfərɪn//
 
[uncountable]
 
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a substance that is used as a poison to kill rats and also for people as a medicine to make the blood thinner, for example in the treatment of thrombosis Word Origin 1950s: from the initial letters of Wisconsin Alumni Research Foundation + -arin on the pattern of coumarin.
See the Oxford Advanced American Dictionary entry: warfarin