What does autoclaved mean?
Autoclaved is the past tense and past participle of the verb autoclave, meaning sterilized by exposure to pressurized steam inside an autoclave — a sealed, self-locking chamber that heats contents well above the boiling point of water. Because ordinary boiling fails to kill heat-resistant bacterial spores, autoclaving at roughly 121°C under pressure has become the gold standard for sterility in hospitals, dental practices, research laboratories, and industries ranging from pharmaceuticals to aerospace composites. The word appears almost entirely in technical writing and professional speech, typically in the passive voice: instruments are autoclaved, media are autoclaved, waste is autoclaved. It derives from French, combining the Greek-rooted prefix auto- ('self') with claver ('to lock'), a reference to the chamber's self-sealing lid. For anyone working where contamination matters, knowing whether something has been properly autoclaved is not vocabulary pedantry — it is a matter of safety.
verb (past tense and past participle of "autoclave")Sterilized using an autoclave — a sealed chamber that uses pressurized steam at high temperature to destroy bacteria, viruses, fungi, and spores.
- Past tense and past participle of autoclave: subjected to steam sterilization under high pressure in an autoclave.
"All surgical instruments must be autoclaved before each procedure."
"The laboratory technician autoclaved the glassware before beginning the culture experiments."
"Only properly autoclaved tools may be used in the operating theatre."
The word 'autoclave' literally means 'self-locking' in French — the chamber seals itself shut under pressure before it can sterilize anything inside it.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of autoclaved
Autoclave entered English from French in the late 19th century, combining auto- (from Greek autos, 'self') with claver, 'to lock', ultimately from Latin clavis, 'key'. The name refers to the device's self-sealing door, which locks shut under internal pressure. Cognates sharing the Latin root include clavicle, conclave, and enclave.
Related word forms
How autoclaved is actually used
Almost exclusively used in scientific, medical, laboratory, dental, and industrial contexts. It is technical register rather than everyday speech; in casual contexts people say 'sterilized' instead. Typically used as a passive participle ('the instruments were autoclaved') rather than describing people or living things.