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p-aminobenzoic acid(PAB) (PABA) [ah-me″no-ben-zo´ik]
a substance required for the synthesis of folic acid by many organisms; it is included in the B vitamin complex, although it is not an essential nutrient for humans. It is synthesized by many bacteria; sulfonamides act by blocking its synthesis; it also absorbs ultraviolet light, specifically UVB rays, and is used as aminobenzoic acid as a topical sunscreen.
para-aminobenzoic acid/para-ami·no·ben·zo·ic ac·id/ (par″ah-ah-me″no-ben-zo´ik) aminobenzoic acid.
para-aminobenzoic acid(păr′ə-ə-mē′nō-bĕn-zō′ĭk, -ăm′ə-)
a compound that is a growth factor for certain bacteria that use it to synthesize folic acid. Sulfonamides act by blocking a step in this synthesis. Abbreviated PAB, PABA.