phenol /fēˈnol/

1. Carbolic acid, a weak acid, C₆H₅OH, produced as hygroscopic needles from coal tar, a powerful disinfectant
2. Extended to the class of aromatic compounds with one or more hydroxyl groups directly attached to the benzene nucleus, weak acids with reactions of alcohols

phēnˈolate noun

A salt of a phenol

phenolˈic adjective

phenolphthalein /fē-nol-fthalˈi-in or -thalˈ/ noun

A substance (C₂₀H₁₄O₄) derived from phenol and phthalic anhydride, brilliant red in alkalis, colourless in acids, used as an indicator

phenolic resins plural noun

A group of plastics made from a phenol and an aldehyde

phenol red noun

A red dye used to indicate pH and to test kidney function

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