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The following 4 entries include the term 4.
4-aminobiphenyl
noun: a carcinogenic chemical compound C12H11N with a floral odor that is present in tobacco smoke, occurs as an impurity in diphenylamine, was formerly used as a stabilizer of rubber and in the manufacture of azo dyes, and is now chiefly limited to use in laboratory research
2,4-dichlorophenoxyacetic acid
noun2,4-D
noun: a white crystalline irritant compound C8H6Cl2O3 used as a weed killer see agent orange
2,4,5-T
noun: an irritant compound C8H5Cl3O3 used especially formerly as an herbicide and defoliant see agent orange
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Merriam-Webster unabridged
