pentachlorophenol
noun
pen·ta·chlo·ro·phe·nol
ˌpen-tə-ˌklȯr-ə-ˈfē-ˌnōl
-fi-ˈnōl
: a crystalline compound C6Cl5OH used especially as a wood preservative and fungicide and a disinfectant
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Merriam-Webster unabridged
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