Source : Webster's Revised Unabridged Dictionary (1913)

Gamut \Gam"ut\, n. [F. gamme + ut the name of a musical note. F.
   gamme is fr. the name of the Greek letter ?, which was used
   by Guido d'Arezzo to represent the first note of his model
   scale. See {Gamma}, and {Ut}.] (Mus.)
   The scale.

Source : WordNet®

gamut
     n 1: a complete extent or range: "a face that expressed a gamut
          of emotions"
     2: the entire scale of musical notes

Source : Free On-Line Dictionary of Computing

gamut
     
        The gamut of a {monitor} is the set of colours it can display.
        There are some colours which can't be made up of a mixture of
        red, green and blue phosphor emissions and so can't be
        displayed by any monitor.
     
        [Examples?]
     
        (1994-11-29)