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countable and uncountable, plural phenols
(organic chemistry, uncountable) A caustic, poisonous, white crystalline compound, C6H5OH, derived from benzene and used in resins, plastics, and pharmaceuticals and in dilute form as a disinfectant and antiseptic; once called carbolic acid examples
(organic chemistry, countable) Any of a class of aromatic organic compounds having at least one hydroxyl group attached directly to the benzene ring (or other aromatic ring) examples