1
: a usually complicated electronic device whose internal mechanism is usually hidden from or mysterious to the user
broadly
: anything that has mysterious or unknown internal functions or mechanisms
2
: a crashworthy device in aircraft for recording cockpit conversations and flight data
3
: a device in an automobile that records information (such as speed, temperature, or gasoline efficiency) which can be used to monitor vehicle performance or determine a cause in the event of an accident
: being or containing a warning of a serious or life-threatening side effect (such as stroke or muscle damage) that is highlighted by a black border on a prescription drug's label or accompanying literature
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Merriam-Webster unabridged
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