siren UK /ˈsaɪəɹən/US /ˈsaɪɹən/noun 10verb 2adjective 1forms 4phrases 1 noun10 •a machine on a vehicle or a building that makes a very loud noise to warn people of dangerMy attention was diverted from this sight by a furious yelling, like that of the thing called a siren in our manufacturing towns. — 1898 •A musical instrument, one of the few aerophones in the percussion section of the symphony orchestra (patented as Acme Siren in 1895). •One of a group of nymphs who lured mariners to their death on the rocks.Now give ear to what I'm about to say to you, / and a god himself will bring it before your mind. / First, you will come to the Sirens. / These beings enthrall all men who arrive before them. […] — 2008 •A dangerously seductive woman. •One who sings sweetly and charms. •A member of Sirenia, an order of mammals. •A member of a genus of aquatic salamanders of the family Sirenidae, commonly used for all species in the family Sirenidae. •An instrument for demonstrating the laws of beats and combination tones. •An astrophysical event that can be used for calculating cosmic distances. •Any of various nymphalid butterflies of the genus Hestina. verb2 •To make a noise with, or as if with, a siren. •To drive with a siren on. adjective1 •Relating to or like a siren. formssirened · sirening · sirens · sirenes Phrases with siren siren songAn enticing but dangerous appeal, especially a misleading one.