pentachlorophenol Syllabification: (pen·ta·chlo·ro·phe·nol)Pronunciation: /ˌpentəˌklôrəˈfēnäl/Definition of pentachlorophenol noun Chemistry a colorless, crystalline, synthetic compound used in insecticides, fungicides, weed killers, and wood preservatives. Chemical formula: C6Cl5OH pentachlorophenol in other Oxford dictionaries Definition of pentachlorophenol in the British & World English dictionary
