Definition that contains warning signal
- light a visual warning signal
- siren a warning signal that is a loud wailing sound
- maroon an exploding firework used as a warning signal
- foghorn a loud low warning signal that can be heard by fogbound ships
- fogsignal a loud low warning signal that can be heard by fogbound ships
- red flag a flag that serves as a warning signal
- fusee a colored flare used as a warning signal by trucks and trains
- fuzee a colored flare used as a warning signal by trucks and trains
- burglar alarm a loud warning signal produced by a burglar alarm
- air alert the warning signal that begins a period of preparation for an enemy air attack