noun
siren
SIGH-run/ˈsaɪrən/
A device that makes a loud warning sound, or the sound itself.
The outdoor siren produces a loud sound to warn people.

Etymology
A Seirēn was a mythical singer whose song lured sailors to destruction. The name later shifted from a creature known for its voice to a mechanical device producing a warning sound.
In context
We never got any warning to evacuate here. All we got was the little the The the tur- the tornado siren going off.
More examples
- The ambulance approaches with its siren blaring.
- We hear a siren and pull over to let the fire truck pass.
- The town tests its tornado sirens every month.
Forms
siren · sirens