#1 siren n. [Siren] a sea nymph (part woman and part bird) supposed to lure sailors to destruction on the rocks where the nymphs lived; "Odysseus ordered his crew to plug their ears so they would not hear the Siren's fatal song". wn
#2 siren n. [enchantress, temptress, Delilah, femme fatale] a woman who is considered to be dangerously seductive. wn
#3 siren n. a warning signal that is a loud wailing sound. wn
#4 siren n. an acoustic device producing a loud often wailing sound as a signal or warning. wn
#5 siren n. eellike aquatic North American salamander with small forelimbs and no hind limbs; have permanent external gills. wn
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