What does ampule mean?
An ampule is a small, hermetically sealed container, traditionally made of glass, that holds a single measured dose of a liquid — most commonly an injectable medication such as epinephrine, lidocaine, or sterile water. Its defining feature is that it has no cap or stopper: to access the contents, the user snaps off the narrow neck, which is often pre-scored for a clean break. This design guarantees sterility and prevents tampering or reuse, which is why ampules remain standard in hospitals, ambulances, and laboratories despite the popularity of vials and prefilled syringes. The word carries a distinctly clinical register and appears mainly in medical, pharmaceutical, and scientific writing. Spelling varies by region: "ampule" is the usual American form, while "ampoule" dominates in British English and internationally. Beyond medicine, the term extends to small sealed containers used for perfume samples, adhesives, and other substances where air exposure must be prevented until the moment of use.
nounA small sealed glass or plastic container holding a single dose of a liquid medication or other substance, typically opened by snapping off the narrow neck.
- A small sealed glass container holding one measured dose of a drug or injectable solution, opened by breaking off the neck.
- By extension, any small sealed single-use container for a liquid or volatile substance (e.g., perfume samples, laboratory reagents).
"The nurse cracked open an ampule of epinephrine and drew the dose into a syringe."
"The pharmacist handed her a cardboard tray of glass ampules filled with sterile saline."
"Perfume houses often ship fragrance samples in tiny plastic ampules to keep the scent from evaporating."
Standard regular plural; sometimes written "ampoules" under the British spelling.
"The crash cart was stocked with a dozen ampules of emergency medications."
An ampule is designed to be destroyed by its own user — you snap its neck off to get inside, so every opening is also an ending.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of ampule
The word traces back through French to the Latin "ampulla," a diminutive of "amphora," the two-handled jar of the ancient Mediterranean world. The Latin ampulla was itself a small flask, used for oil, perfume, and wine, giving the modern word both its shape and its name. English adopted the term via the French "ampoule" in the nineteenth century as sealed single-dose medication containers came into clinical use, with the American spelling "ampule" emerging as a simplified variant.
How ampule is actually used
Register is largely technical and clinical; the word appears most often in medical, pharmaceutical, and laboratory contexts. In American English it is usually spelled "ampule," while "ampoule" predominates in British English and much of Europe — both refer to the identical object. The plural is standard.
Easily confused with ampule
"Ampoule" is simply the more common British and international spelling of the same word; "ampule" is the standard American form.
A vial is a small bottle, usually with a screw cap or stopper and often holding multiple doses, whereas an ampule is hermetically sealed and meant to be broken open once.