n.
Pronunciation: ' wo ̇ r-f ə -r ə n
Function: noun
Etymology: W isconsin A lumni R esearch F oundation (its patentee) + coum arin
Date: 1950
: a crystalline anticoagulant coumarin derivative C 19 H 16 O 4 used chiefly in the form of its sodium salt as a rodent poison and in medicine