What does sterilising mean?
Sterilising means making something completely free from living microorganisms, including bacteria, spores, and other organisms that ordinary cleaning may not eliminate. It is commonly performed through heat, radiation, chemicals, or filtration and is widely used in hospitals, laboratories, food production, and instrument cleaning. The word can also refer to making a person or animal infertile, although in that context it may sound clinical and can concern surgical or reproductive procedures. Sterilising is generally more precise than disinfecting: sterilisation seeks to eliminate microbial life, whereas disinfection reduces or inactivates many microorganisms without necessarily removing every form. In British usage the spelling is “sterilise,” while American English normally uses “sterilize”; both forms are widely understood.
To make an object, substance, or environment free from living microorganisms.
"The facility uses a chemical process for sterilising the containers."
This sense is common in medicine, laboratories, food processing, and industry. “Sterilising” is the British spelling of “sterilizing.”
To make a person or animal infertile.
"The clinic advises owners about the risks of sterilising their pets."
This sense is more formal and potentially sensitive; in medical contexts, “sterilisation” may be preferred.
Serving to make something sterile or free from microorganisms.
"The technician selected the sterilising chamber for the delicate components."
Usually hyphenated before a noun, as in “sterilising equipment” or “sterilising solution.”
Sterilising aims to eliminate microbial life, while disinfecting merely reduces or inactivates many microorganisms.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does sterilising come from?
The word comes from the English adjective “sterile,” which derives from Latin sterilis, meaning “barren” or “unproductive.” The verb “sterilise” or “sterilize” was formed from that adjective with the suffix “-ise” or “-ize,” following the standard English pattern for making verbs from adjectives. Related words include “sterility,” “sterilisation,” and “sterilization.”
Related word forms
How sterilising is actually used
In British English, “sterilise” is preferred, though “sterilize” is also common in American English and increasingly understood in Britain. The form is normally hyphenated when placed before a noun, as in “sterilising equipment.” The term is more technical than the broader “disinfecting” and is especially associated with medicine, laboratories, and food processing.