Monochrome comes from the Greek μονόχρωμος (monochromos), meaning “of one color”, which is a combination of μόνος (monos), meaning “alone” or “solitary”, an χρώμα (chroma), meaning “color”. Monochromatic light is light of a single wavelength, though in practice it can refer to light of a narrow wavelength range. A monochromatic object or image is one whose range of colors consists of shades of a single color or hue; monochrome images in neutral colors are also known as grayscale or black-and-white.