a warning signal that is a loud wailing sound(noun.communication)
source: wordnet30
an acoustic device producing a loud often wailing sound as a signal or warning(noun.artifact)
source: wordnet30
eellike aquatic North American salamander with small forelimbs and no hind limbs; have permanent external gills(noun.animal)
source: wordnet30
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.(noun)