One of three sea nymphs, – or, according to some writers,
of two, – said to frequent an island near the coast of Italy, and to
sing with such sweetness that they lured mariners to destruction.

An enticing, dangerous woman.

Something which is insidious or deceptive.

A mermaid.

Any long, slender amphibian of the genus Siren or family
Sirenidae, destitute of hind legs and pelvis, and having permanent
external gills as well as lungs. They inhabit the swamps, lagoons, and
ditches of the Southern United States. The more common species (Siren
lacertina) is dull lead-gray in color, and becames two feet long.

Of or pertaining to a siren; bewitching, like a siren;
fascinating; alluring; as, a siren song.