What does cresol mean?
Cresol refers to any of three closely related organic compounds — ortho-, meta-, and para-cresol — each consisting of a methyl group attached to a phenol molecule, giving them the alternative name methylphenols. These colorless to yellowish liquids, which occur naturally in coal tar and can also be produced synthetically, have a sharp, phenolic smell reminiscent of old-fashioned disinfectants. Cresols are notably toxic: they are absorbed readily through the skin and can cause severe burns, so handling them requires strict precautions. Despite the hazard, they have long been valued commercially, most famously in coal-tar disinfectants of the kind pioneered in nineteenth-century antiseptic surgery. Today cresols serve mainly as raw materials for resins, plasticizers, antioxidants, and phosphate-ester products, while mixtures of the isomers are sold as cresylic acid. The word belongs firmly to technical registers — chemistry, medicine, and industrial manufacturing — rather than everyday conversation, but it remains important wherever phenolic chemistry is discussed.
nounCresol is any of three toxic, aromatic organic compounds — ortho-, meta-, and para-cresol (methylphenols) — found in coal tar and wood tar. Cresols are colorless to yellowish liquids with a distinctive phenolic odor, used chiefly as disinfectants, in resins, and as chemical intermediates.
- Chemistry: any of the three isomeric methylphenols (o-, m-, p-cresol), toxic phenolic liquids obtained from coal tar.
- Industry: a mixture of cresol isomers (cresylic acid) used as a disinfectant and in making resins, phosphate esters, and solvents.
"The disinfectant's sharp odor came from cresol, long used for sterilizing surgical instruments."
"Cresol isomers are separated industrially by distillation because their boiling points differ only slightly."
"The laboratory stock of cresol was stored under a fume hood owing to its toxicity through skin absorption."
The plural is standard when naming the three isomers individually or collectively; the singular mass-noun form is usual for the substance generically.
"Commercial cresols are usually sold as a mixture of all three isomers."
Cresol gave the classic 'carbolic' smell of old hospital antiseptics — the same family of compounds Lister used to make surgery survivable.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cresol
Cresol was coined in the mid-nineteenth century from Greek krēas, meaning flesh or meat, combined with the -ol suffix denoting an alcohol or hydroxyl compound; the name reflects the meat-like, tallowy odor associated with some of these substances, echoing the earlier coinage creosote. It entered scientific vocabulary during the flourishing of coal-tar chemistry in Germany and Britain, alongside related terms such as phenol and naphthol. The -ol ending ties it to a broad family of chemical names derived ultimately from Latin oleum, oil.
How cresol is actually used
Cresol is a technical term used mainly in chemistry, pharmacology, and industry; it is rarely encountered in everyday speech. It is typically treated as a mass noun when referring to the substance generally ('cresol is toxic'), though plural forms occur when distinguishing the individual isomers.
Easily confused with cresol
Creosote is a mixture of tarry chemicals derived from wood or coal, whereas cresol is one specific methylphenol compound that occurs within such mixtures.