siren Definition

1. A device that gives out a loud wailing noise, usually as a warning signal.

Thesaurus: alarm, signal, whistle, horn.
2. An irresistible woman thought capable of ruining men's lives; a femme fatale.

Thesaurus: temptress, seductress, charmer, femme fatale, vamp.
3. A bewitching and fascinating singer.
4. Greek mythol.
A certain sea-nymph, part-woman, part-bird, whose seductive songs lured sailors to their deaths on the rocks. See also Lorelei.
Form: Siren
5. Any eel-like amphibian with no hind legs or external gills.