What does kreosote mean?
Kreosote is a dark, oily substance traditionally obtained by heating wood without oxygen, a process known as destructive distillation. It became important as a preservative for timber, railway sleepers, telephone poles, and other wooden materials exposed to damp or insects. It was also formerly used in medicines, mouthwashes, deodorants, and preparations for treating skin conditions, although its internal use is now obsolete or restricted because of its toxicity. In modern usage, “creosote oil” often identifies the heavier oily fraction used in wood preservation, while the broader term “creosote” can refer to the overall distillation product. The name combines Greek roots meaning “flesh” and “preserver,” reflecting its original reputation for preventing decay. Although largely replaced by newer preservatives in many applications, it remains familiar through creosoted utility poles, railroad ties, and the distinctive smell associated with treated timber.
A dark, oily liquid obtained from the destructive distillation of wood, used especially as a timber preservative and formerly in medicines and deodorants.
"The fence posts were treated with creosote to increase their resistance to rot."
The term is sometimes used more narrowly for the heavy oily fraction of the distillation product, elsewhere called creosote oil. Its former medicinal uses are historical, and it should not be taken internally unless directed by a qualified medical professional.
To treat wood or another material with creosote, typically to protect it from decay or insect damage.
"Workers creosoted the timbers before constructing the footbridge."
Usually used in the passive or with the material as the object; less common in general contemporary prose.
Plural forms are uncommon because the word normally refers to a particular substance rather than countable objects.
"The formulas were tested against several commercial creosotes."
The name means “meat preserver”: Greek words for flesh and saving were combined to describe a substance valued for keeping wood from rotting.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does kreosote come from?
The word comes through German Kreosot from Greek kreas, “flesh,” and sōtēr, “preserver” or “savior.” It was applied to substances associated with the preservation of flesh and later to the oily preservative obtained from wood. Related English words including creatine and carnivore reflect the Greek root for flesh, while soter preserves the root meaning “savior.”
Related word forms
How kreosote is actually used
In modern technical contexts, “creosote” and “creosote oil” are sometimes distinguished, although usage varies. The medicinal sense is largely historical. Creosote-treated timber may have a strong oily smell and is not suitable for burning or using in food preparation.
Easily confused with kreosote
Creosote may name the overall oily product of destructive wood distillation, while creosote oil more specifically denotes its heavier oily fraction.