[n] eel-like aquatic North American salamander with small forelimbs and no hind limbs; have permanent external gills
[n] an acoustic device producing a loud often wailing sound as a signal or warning
[n] a warning signal that is a loud wailing sound
[n] a woman who is considered to be dangerously seductive
[n] a sea nymph (part woman and part bird) supposed to lure sailors to destruction on the rocks where the nymphs lived; "Odysseus ordered his crew to plug their ears so they would not hear the Siren's fatal song"