Source : Webster's Revised Unabridged Dictionary (1913)

Monochrome \Mon"o*chrome\, n. [Gr. ? of one color; ? single + ?
   color: cf. F. monochrome.]
   A painting or drawing in a single color; a picture made with
   a single color.

Source : WordNet®

monochrome
     adj : having or appearing to have only one color [syn: {monochromatic},
            {monochromic}, {monochromous}]
     n 1: painting done in a range of tones of a single color
     2: a black-and-white photograph or slide [syn: {black and white}]

Source : Free On-Line Dictionary of Computing

monochrome
     
         Literally "one colour".  Usually used for a black
        and white (or sometimes green or orange) {monitor} as distinct
        from a color monitor.  Normally, each {pixel} on the display
        will correspond to a single bit of {display memory} and will
        therefore be one of two intensities.  A {grey-scale} display
        requires several bits per {pixel} but might still be called
        monochrome.
     
        Compare: {bitonal}.
     
        (1994-11-24)