Definition of para-aminobenzoic acid in US English:

para-aminobenzoic acid

(also PABA)


  • A crystalline acid that is widely distributed in plant and animal tissue. It has been used to treat rickettsial infections and is widely used in suntan lotions and sunscreens to absorb ultraviolet light.

    Chemical formula: NH₂C₆H₄COOH

    • ‘Some supplement manufacturers include herbs like black cohosh or nonessential nutrients like para-aminobenzoic acid in their multivitamins.’
    • ‘Fish oil capsules or supplements containing large amounts of para-aminobenzoic acid can elevate blood sugar.’
    • ‘A few years ago, most sunscreens contained ingredients known as PABAs, para-aminobenzoic acid and its derivatives.’
    • ‘Folic acid is composed of three primary structures, a hetero-bicyclic pteridine ring, para-aminobenzoic acid, and glutamic acid.’
    • ‘Cyclodextrin can act as an efficient inhibitor of the photosensitized dimerization of thymine by para-aminobenzoic acid in aqueous solution.’


para-aminobenzoic acid

/ˌparə əˌmēnōˌbenˌzōik ˈasid/