What does clostridium mean?
Clostridium is a genus of bacteria made up of anaerobic, rod-shaped organisms that form resilient spores, allowing them to survive in soil, dust, water, and the intestinal tracts of humans and animals. Because they flourish where oxygen is absent, certain species are notorious causes of serious illness: Clostridium tetani produces tetanus, Clostridium botulinum causes botulism, and Clostridium difficile is a well-known source of severe diarrhoea after antibiotic use. In everyday language the word appears mainly in medical reports, microbiology, and food-safety discussions, usually italicised alongside a species name. Despite its fearsome reputation, the genus also has benign and even useful members, and one toxin derived from it underlies Botox. The plural form is clostridia, and the adjective clostridial describes infections or features relating to these bacteria.
nounA bacterium of a genus (Clostridium) of anaerobic, spore-forming rod-shaped bacteria, several species of which cause serious disease in humans and animals.
- Any bacterium belonging to the genus Clostridium, comprising anaerobic, spore-forming, rod-shaped bacteria found in soil, water, and the intestines of humans and animals.
- The genus Clostridium itself as a taxonomic group.
"The wound infection was traced to Clostridium perfringens present in contaminated soil."
"Doctors identified Clostridium difficile as the cause of the patient's persistent diarrhoea following antibiotic treatment."
"Because Clostridium tetani thrives in deep, oxygen-poor wounds, puncture injuries carry a particular risk of tetanus."
The plural follows the Latin neuter pattern and is the standard form in scientific contexts; 'clostridiums' is not used.
"Several clostridia were isolated from the soil sample."
One member of this genus, Clostridium botulinum, produces the most lethal natural toxin known — yet a purified dose of it is what smooths wrinkles as Botox.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of clostridium
The name Clostridium was coined in the late nineteenth century from modern Latin, ultimately drawing on the Greek noun klōstēr, meaning a spindle or thread-winder, a reference to the bacteria's spindle-like shape when they swell with spores. The same Greek root passed into Latin as claustrum, an enclosure, which gives English such relatives as cloister and enclose. The word entered English through scientific Latin classification and has remained a stable technical term since.
Related word forms
How clostridium is actually used
A scientific, formal term used almost exclusively in medical, microbiological, and veterinary contexts. In running text the genus name is conventionally italicised and often paired with a species epithet (e.g. Clostridium botulinum); in casual clinical shorthand it may appear unitalicised. The plural 'clostridia' is standard in scientific writing.
Easily confused with clostridium
Bacillus is a different bacterial genus that is aerobic or facultatively anaerobic, whereas Clostridium species are strictly anaerobic and form spores.