1. 
   Coumarins
   Powerful anti-coagulant plant chemicals. Used to prevent blood clotting
   Found op http://www.woodlandherbs.co.uk/acatalog/glossary.html
   
   
2. 
   coumarins
   <chemical> Synthetic or naturally occurring substances related to coumarin, the delta-lactone of coumarinic acid. Coumarin itself occurs in the tonka bean. The various coumarins have a wide range of proposed actions and uses including as anticoagulant, pharmaceutical aids, indicators and reage...
   Found op http://www.mondofacto.com/facts/dictionary?coumarins
   
   

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