epipen

Short definition from Wiktionary

Noun

1. 1
   An epinephrine/adrenaline autoinjector. A device designed to ease the symptoms of anaphylaxis/anaphylactic shock, so as to save the life of the victim of the extreme allergic reaction, by injecting a dose of adrenaline/epinephrine through a spring-loaded needle that punches into the tissue it is triggered against.
2. 2
   Alternative form of epipen (genericized term)

Proper noun

1. 1
   A brandname for an epinephrine autoinjector: A device for the autoinjection of adrenaline; used by people who suffer from severe allergies and risk anaphylactic shock.