Merriam-Webster Collegiate Dictionary - siren

 I. noun  Etymology: Middle English, from Middle French & Latin; Middle French sereine, from Late Latin ~a, from Latin ~, from Greek seiren  Date: 14th century  1. often capitalized any of a group of female and partly human creatures in Greek mythology that lured mariners to destruction by their singing  2.  a. a woman who sings with enchanting sweetness  b. temptress  c. temptation 2  3.  a. an apparatus producing musical tones especially in acoustical studies by the rapid interruption of a current of air, steam, or fluid by a perforated rotating disk  b. a device often electrically operated for producing a penetrating warning sound an ambulance ~ an air-raid ~  4. New Latin, from Latin either of two North American eel-shaped amphibians that constitute a genus (Siren) and have small forelimbs but neither hind legs nor pelvis and have permanent external gills as well as lungs  II. adjective  Date: 1568 resembling that of a ~ ; enticing