Monochrome
Something which is
monochromatic has a single
color. In
physics, the word is used more specifically to refer to a
electromagnetic radiation of a single
wavelength. A monochrome
computer display is capable of displaying only a single color, often
green or
white.
The word monochromatic comes from the two Greek words mono (meaning "one"), and chroma (χρωμα, meaning "surface" or "the colour of the skin").