The Collaborative International Dictionary of English v.0.48:

Polychrome \Pol"y*chrome\, n. [Poly- + Gr. ? color.] (Chem.)
   Esculin; -- so called in allusion to its fluorescent
   solutions. [R.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Polychrome \Pol"y*chrome\, a. [Cf. F. polychrome.]
   Executed in the manner of polychromy; as, polychrome
   printing.
   [1913 Webster]

WordNet (r) 3.0 (2006):

polychrome
    adj 1: having or exhibiting many colors [syn: polychromatic,
           polychrome, polychromic]
    n 1: a piece of work composed of or decorated in many colors
    v 1: color with many colors; make polychrome [syn: polychrome,
         polychromize, polychromise]

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "polychrome":
   bicolor, bicolored, colorful, colory, crazy, daedal, dichroism,
   dichromatic, dichromatism, discolor, divers-colored, freehand,
   graphic, harlequin, kaleidoscopic, many-colored, medley,
   monochrome, motley, multicolor, multicolored, multicolorous,
   multihued, painty, parti-color, parti-colored, pastose,
   photographic, pictorial, picturable, pictural, picturesque,
   polychromatic, polychromatism, polychromic, prismal,
   riot of colors, scenographic, scumbled, shot, shot through,
   spectral, thunder and lightning, trichroism, trichromatic,
   trichromic, tricolor, tricolored, two-tone, varicolored,
   variegated, variegation, versicolor, versicolored