Klein n 1: German mathematician who created the Klein bottle (1849-1925) [syn: {Felix Klein}] 2: United States psychoanalyst (born in Austria) who was the first to specialize in the psychoanalysis of small children (1882-1960) [syn: {Melanie Klein}] 3: United States fashion designer noted for understated fashions (born in 1942) [syn: {Calvin Klein}, {Calvin Richard Klein}]