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