auto-injector
noun
au·to-in·ject·or
ˌȯ-tō-in-ˈjek-tər
variants
or less commonly autoinjector
medical
: a device for injecting oneself with a single, preloaded dose of a drug that typically consists of a spring-loaded syringe activated when the device is pushed firmly against the body
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Merriam-Webster unabridged
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