adj :  serving to protect the body or one of its parts from disease or injury < immunization>  <a reflex> 
, n :  an agent (as a medicine or a dressing) that protects the body or one of its parts (as from irritation or injury) <vitamins are s against certain deficiency diseases>  .
 
 
 
Similar sounding terms:  pro·duc·tive 
 
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