Synonym(s): Phenoxy acids, Phenoxy acetic acids, Phytohormones: 2,4-D (2,4-dichlorophenoxyacetic acid), 2,4-DB, 2,4-MCPA (2-methyl-4-chlorophenoxyacetic acid), 2,4-MCPP (methylchlorophenoxy propionic acid or mecoprop), dichlorprop (2,4-DP), fenoprop (2-[2,4,5-trichlorophenoxy] propionic acid