para-aminobenzoic acid

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par·a-a·mi·no·ben·zo·ic ac·id / ˈparə əˌmēnōbenˈzōik/ (abbr.: PABA) • n. Biochem. a crystalline acid, NH2C6H4COOH, that is widely distributed in plant and animal tissue. It has been used to treat rickettsial infections and is used in sunscreens to absorb ultraviolet light.