English translation: injection vial, injection bottle
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so it is a vial to be attached to the syringe. It is mentioned mostly in connection with diabetes.
However, in most medical websites it is just called bottle.
While the term syringe bottle is often used in connection with inkjet printers.
one site calls it syringe bottle in connection to diabetes in a young child:
... he is two and a half and only needs one shot in the morning, so his syringe bottle isn't very full yet.