The Collaborative International Dictionary of English v.0.48:

simvastatin \sim`va*stat"in\, n.
   a chemical substance (C25H38O5) having inhibitory activity
   on the enzyme HMG-CoA reductase, and used in medicine to
   reduce cholesterol levels in blood.

   Syn: synvinolin; MK-733; Zocor.
        [PJC]

WordNet (r) 3.0 (2006):

simvastatin
    n 1: an oral lipid-lowering medicine (trade name Zocor)
         administered to reduce blood cholesterol levels;
         recommended after heart attacks [syn: simvastatin,
         Zocor]