n. A medical device designed to deliver a single dose of a particular, typically life-saving, drug.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a hypodermic syringe to use in injecting yourself with a liquid
Word Usage
"But you must talk with your physician about the autoinjector; you need to ensure it's readily available, on hand, and replaced before its expiration date, or it might not help you when you need it the most."