1. A device in which compressed air or steam is driven against a rotating perforated disk to create a loud, often wailing sound as a signal or warning.
2. an electronic device producing a similar sound as a signal or warning: a police car siren.
3. any of several salamanders of the family Sirenidae, such as the mud eel, having an eellike body, permanent external gills, small forelegs, and no hind limbs.

1. (greek mythology) one of a group of nymphs who lured mariners to their death on the rocks.
2. A device, either mechanical or electronic, that makes a piercingly loud sound as an alarm or signal, or the sound from such a device.
3. A dangerously seductive woman.
4. A common name for salamanders of siren and Sirenidae.
5. A common name for mammals of Sirenia.
6. relating to or like a siren.

1. of or pertaining to a siren; bewitching, like a siren; fascinating; alluring.
2. 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.
3. an enticing, dangerous woman.
4. something which is insidious or deceptive.
5. A mermaid.
6. any long, slender amphibian of the genus siren or family Sirenidæ, 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.
7. an instrument for producing musical tones and for ascertaining the number of sound waves or vibrations per second which produce a note of a given pitch. the sounds are produced by a perforated rotating disk or disks. A form with two disks operated by steam or highly compressed air is used sounding an alarm to vessels in fog.

1. in greek myth, one of two, three, or an indeterminate number of seanymphs who by their singing fascinated those who sailed by their island, and then destroyed them.
2. A mermaid.
3. A charming, alluring, or enticing woman; a woman dangerous from her arts of fascination.
4. one who sings sweetly.
5. A fabulous creature having the form of a winged serpent.
6. in herpetology: any member of the Sirenidæ.
7. A Linnean genus of amphibians, now restricted as the type of the family Sirenidæ. also sirene.
8. one of the Sirenia, as the manatee, dugong, halicore, or sea-cow; any sirenian.
9. an acoustical instrument consisting essentially of a wooden or metallic disk, pierced with holes equidistantly arranged in a circle, which can be revolved over a jet of compressed air or steam so as to produce periodic puffs.
10. an apparatus for testing woods and metals to ascertain their sonorous qualities.
11. in heraldry, the representation of a mermaid, used as a bearing.
12. pertaining to or characteristic of a siren; dangerously alluring; fascinating; bewitching.
13. A monster without lower extremities.
14. same as sympus.

1. eellike aquatic north american salamander with small forelimbs and no hind limbs; have permanent external gills
2. a sea nymph (part woman and part bird) supposed to lure sailors to destruction on the rocks where the nymphs lived
3. an acoustic device producing a loud often wailing sound as a signal or warning
4. a woman who is considered to be dangerously seductive
5. a warning signal that is a loud wailing sound