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:

Monochromatic \Mon`o*chro*mat"ic\, a. [Cf. F. monochromatique.
   See Monochrome.]
   Consisting of one color, or presenting rays of light of one
   color only.
   [1913 Webster]

   Monochromatic lamp (Opt.),a lamp whose flame yields rays of
      some one homogenous light. It is of great importance in
      optical experiments.
      [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):

monochromatic
    adj 1: of or relating to monochromatism
    2: (of light or other electromagnetic radiation) having only one
       wavelength; "monochromatic light" [syn: monochromatic,
       homochromatic] [ant: polychromatic]
    3: having or appearing to have only one color [syn:
       monochromatic, monochrome, monochromic, monochromous]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "monochromatic":
   chromatic, cold, colorific, coloring, cool, dichromatic, glowing,
   harmonious, many-colored, matching, medley, monochrome,
   monochromic, motley, parti-colored, pigmentary, polychromatic,
   prismatic, rainbow, spectral, tinctorial, tingent, toning,
   variegated, warm