hydroxybenzoic acid
noun
hy·droxy·ben·zo·ic acid
-ben-ˌzō-ik-
: 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
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Merriam-Webster unabridged
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