from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an automatic signal (usually a sound) warning of danger
Sorry, no etymologies found.
ALR-67: detects, analyzes, and evaluates electro-magnetic signals, emits a warning signal if the parameters are compatible with an immediate threat to the aircraft, e.g. seeker head on an antiair missile.
This I afterward discovered was one of the secret signs of the San Luang; and the warning signal was addressed to me, because they imagined that I also was a member of the Council.
Suddenly he overturned the camp-bed, throwing Jojo on to the ground, for he thought that there might be an electric switch working a warning signal outside.
Brad glanced uneasily at Percey as he changed the transponder setting — to the code that automatically sent a warning signal to all radar facilities in the area that Foxtrot Bravo was in trouble.