·noun A genus of plants native to Mexico and Central America, of the order Compositae; also, any plant or flower of the genus. The numerous varieties of cultivated dahlias bear conspicuous flowers which differ in color.
The Blue Dahlia is a 1946 American crime film and film noir with an original screenplay by Raymond Chandler directed by George Marshall and starring Alan Ladd, Veronica Lake and William Bendix. It was Chandler's first original screenplay.