alertlamp
nounUK /əˈlɜːt læmp/
US /əˈlɜːrt læmp/
A lamp that turns on to tell you something is happening.
The alertlamp flashed red when the door opened.
RELATED WORDS
OTHER MEANINGS
2. A small light on a machine that shows its status.
Check the alertlamp on the printer to see if it needs paper.
3. A light used to warn people of danger.
The alertlamp above the exit glowed during the fire drill.
4. A light that reminds someone to do something.
An alertlamp on his desk blinked when a new message arrived.