The Collaborative International Dictionary of English v.0.48:

Monochromic \Mon`o*chro"mic\, a.
   Made, or done, with a single color; as, a monochromic
   picture. Called also, monochromatic and monochrome.
   [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Monochrome \Mon"o*chrome\, n. [Gr. ? of one color; mo`nos single
   + ? color: cf. F. monochrome.]
   A painting or drawing in a single color; a picture made with
   a single color.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

black-and-white \black-and-white\, black and white \black and
white\adj. (Photography, Imaging; Printing)
   depicted only in black and white colors, or in shades of
   gray; also called monochromatic and monochrome; -- of
   images. Opposite of color or in color, and contrasting
   with polychrome technicolor three-color; as, a
   black-and-white TV; black-and-white film; the movie
   "Schindler's List" was shot in black and white.

   Syn: black and white, monochromatic, monochrome.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

monochrome
    adj 1: having or appearing to have only one color [syn:
           monochromatic, monochrome, 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, monochrome]

The Free On-line Dictionary of Computing (19 January 2023):

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)