Webster's English Dictionary

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stabilizer

sta.bi.liz.er \-.li--z*r\ n : one that stabilizes something : as  : a 
   substance added to another substance (as an explosive or plastic) or  to a 
   system (as an emulsion) to prevent or retard an unwanted alteration of 
   physical state : a gyroscope device to keep ships steady in a heavy sea  : 
   an airfoil providing stability for an airplane; specif : the fi xed 
   horizontal member of the tail assembly