noun Chemistry.
a colorless, crystalline, water-insoluble anticoagulant, C 19 H 16 O 4 , used chiefly as a rodenticide.
Pharmacology. a preparation of this used in the management of potential or existing clotting disorders.

1945–50; W(isconsin) A(lumni) R(esearch) F(oundation) (owners of patent) + (coum)arin

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World English Dictionary
warfarin (ˈwɔːfərɪn)
a crystalline insoluble optically active compound, used as a rodenticide and, in the form of its sodium salt, as a medical anticoagulant. Formula: C19H16O4
[C20: from the patent owners W(isconsin) A(lumni) R(esearch) F(oundation) + (coum)arin]

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American Heritage
Science Dictionary
warfarin   (wôr'fər-ĭn)  Pronunciation Key 
A white crystalline compound used as a rodenticide and as an anticoagulant in medicine. Warfarin is a derivative of coumarin. Chemical formula: C19H16O4.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
When you are taking warfarin, you are more likely to bleed, even from
  activities you have always done.
When you first start taking warfarin, you will need frequent blood tests.
In rare cases, using warfarin to thin the blood and prevent clots can cause
  brief increased clotting and severe skin wounds.
She recovered, and is on maintenance therapy with warfarin, a blood thinner.
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