Longman Dictionary of Contemporary English homepage

EpiPen

 noun
     
Ep‧i‧Pen [countable] trademark
a medical instrument shaped like a large thick pen with a needle at one end, designed so that someone can inject a special drug into their body quickly and easily if they are having a severe allergic reaction (=are extremely ill because of eating or touching a particular substance) or an asthma attack that might kill them.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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