The Collaborative International Dictionary of English v.0.48:

Chromatophore \Chro"ma*to*phore`\, n. [Gr. ?, ?, color + fe`rein
   to bear.]
   1. (Zool.) A contractile cell or vesicle containing liquid
      pigment and capable of changing its form or size, thus
      causing changes of color in the translucent skin of such
      animals as possess them. They are highly developed and
      numerous in the cephalopods.
      [1913 Webster]

   2. (Bot.) One of the granules of protoplasm, which in mass
      give color to the part of the plant containing them.
      [1913 Webster]