siren：释义

A device in which compressed air or steam is driven against a rotating perforated disk to create a loud, often wailing sound as a signal or warning.

An electronic device producing a similar sound as a signal or warning: a police car siren.

Any of several salamanders of the family Sirenidae, such as the mud eel, having an eellike body, permanent external gills, small forelegs, and no hind limbs.