Definitions of siren:

• noun:   eel-like aquatic North American salamander with small forelimbs and no hind limbs; have permanent external gills
• noun:   an acoustic device producing a loud often wailing sound as a signal or warning
• noun:   a warning signal that is a loud wailing sound
• noun:   a sea nymph (part woman and part bird) supposed to lure sailors to destruction on the rocks where the nymphs lived

  Example: "Odysseus ordered his crew to plug their ears so they would not hear the Siren's fatal song"

• noun:   a woman who is considered to be dangerously seductive
• name:  A surname (very rare: popularity rank in the U.S.: #45402)