An ampule is a small glass container with a sealed top, used to store and preserve liquids and medications. There are several synonyms for ampule, including vial, phial, flask, ampoule, and small bottle. Vial or phial refers to a small glass or plastic bottle used for storing liquid medicines, while a flask is a more elaborate container with a wider opening. Ampoule is similar to an ampule but often refers to a small, sealed glass container used for injecting medications. Finally, a small bottle is a general term for any type of tiny container used for storing liquids, including perfumes and essential oils.