What does creosote mean?
Creosote is a dark brown or blackish oily liquid produced by distilling tar from coal or wood. It has powerful antiseptic and water-resistant properties, which made it historically invaluable as a preservative for timber — most famously for railway sleepers, telegraph poles, and marine pilings, where it protected wood against rot, insects, and moisture for decades at a time. The word also functions as a verb: to creosote a shed or fence is simply to coat it with this substance, a familiar chore in older British gardening practice. Because coal-tar creosote is now recognised as toxic and potentially carcinogenic, its domestic use has been banned or restricted in many countries, and it survives mainly as an industrial treatment. A related but distinct usage appears in the American Southwest, where 'creosote' names a hardy desert shrub whose leaves give off a pungent smell reminiscent of the tar product after rainfall.
A dark brown or black oily liquid distilled from coal tar or wood tar, used chiefly as a preservative for wood and formerly as a disinfectant.
"The telegraph poles were impregnated with creosote to withstand decades of exposure."
Coal-tar creosote is classified as hazardous in many jurisdictions; consumer sale has been restricted in the UK since 2003 and in the EU under biocidal products regulations.
To treat or coat wood with creosote in order to preserve it.
"He spent the afternoon creosoting the fence panels before the rain arrived."
Creosote was once so ubiquitous on railway lines that its distinctive smoky smell became the scent of train travel itself.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of creosote
The word 'creosote' was coined in the early 19th century by the German chemist Karl Ludwig Reichenbach, who discovered the substance in wood tar around 1830. He formed it from Greek roots: 'kreas', meaning flesh or meat, and 'sōzein', meaning to preserve — reflecting his belief that the substance could preserve meat. The name thus literally means 'flesh-preserver'. Related English words drawing on the same Greek roots include 'creatinine' and other biochemical terms built on 'kreas'.
How creosote is actually used
In modern usage 'creosote' as a noun most often refers to the coal-tar product used industrially; domestic use of creosote for fences has been heavily restricted in many countries due to health concerns. The verb form is common in British English gardening contexts. Note also the distinct American sense referring to the desert plant 'creosote bush', named for its smell resembling that of creosote.
Easily confused with creosote
Creatine is a nitrogenous organic acid involved in energy metabolism in muscle; creosote is a tar-derived oily liquid used as a wood preservative — the two share no connection beyond a superficial sound resemblance.