The term "hyphenated techniques", introduced by Hirschfeld, refers to an online combination of a chromatographic (later also electrophoretic) separation technique with a sensitive element or molecule specific detector.

see: T. Hirschfeld, Anal. Chem., 52 (1980) 297 A

NB!: A slash is sometimes used instead of hyphen, especially if the name of one of the methods contains a hyphen itself.