1. 
   oestrogen antagonist
   <pharmacology> A drug or compound which inhibit or antagonise the action or biosynthesis of oestrogen. ... Tamoxifen also has agonist or stimulatory actions as well as blocking effects. There are also selective oestrogen-receptor modulators (SERMs). For example, raloxifene (trade name Evista) ...
   Found op http://www.mondofacto.com/facts/dictionary?oestrogen+antagonist
   
   

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