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hy·droxy·ben·zo·ic acid

n :  any of three crystalline derivatives C7H6O3 of benzoic acid that contain one hydroxyl group per molecule: as  a  :  the colorless para-substituted acid used in making several of its esters that are effective preservatives - called also parahydroxybenzoic acid   b  :  SALICYLIC ACID .
 
 

 
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