What does sterilised mean?
Sterilised is the adjective form of “sterilise,” the British spelling of the verb commonly written “sterilize” in American English. It describes an object, substance, or place that has been treated to remove or destroy microorganisms such as bacteria, viruses, and spores. Sterilised surgical instruments, laboratory glassware, and milk are common examples. In a second, less frequent sense, sterilised refers to a person or animal that has been made unable to reproduce, although this use is more associated with contraception and animal management. The word is technical and factual rather than emotional, and it carries a strong implication of cleanliness and controlled preparation. It is often confused with “sterile,” but “sterile” has the additional important meaning of barren or unproductive.
Made free from bacteria, viruses, or other microorganisms; rendered sterile.
"Only sterilised tools should be used in the laboratory."
This is the dominant modern meaning in medical, scientific, and domestic contexts.
Rendered unable to reproduce.
"The programme was intended to keep the sterilised animals apart from the breeding herd."
This sense is less common and is especially used in biological, agricultural, and population-management contexts.
Sterilised means free from microbial life, a promise made by heat, chemicals, filtration, or other carefully controlled processes.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does sterilised come from?
The word belongs to a family derived from Latin “sterilis,” meaning barren, infertile, or unproductive. English borrowed the related adjective “sterile” in the Middle English period and later formed the verb “sterilise” or “sterilize” by adding the suffix “-ise” or “-ize.” The modern meaning referring to the elimination of microorganisms developed alongside advances in medicine and public hygiene.
Related word forms
How sterilised is actually used
In medical, laboratory, and food contexts, “sterilised” usually means that all microorganisms have been eliminated, a stronger claim than merely being disinfected. The British spelling uses “-ise,” while American English generally uses “-ize.”
Easily confused with sterilised
“Sterilised” usually means that something has been treated to remove or kill microorganisms, whereas “sterile” can also mean infertile or barren, as in “sterile land.”