n. 1 a a device for making a loud prolonged signal or warning sound, esp. by revolving a perforated disc over a jet of compressed air or steam. b the sound made by this. 2 (in Greek mythology) each of a number of women or winged creatures whose singing lured unwary sailors on to rocks. 3 a sweet singer. 4 a a dangerously fascinating woman; a temptress. b a tempting pursuit etc. 5 (attrib.) irresistibly tempting. 6 an eel-shaped tailed amphibian of the family Sirenidae. siren suit a one-piece garment for the whole body, easily put on or taken off, orig. for use in air-raid shelters.
[ ME f. OF sereine, sirene f. LL Sirena fem. f. L f. Gk Seiren ]