Green

. The hue of that portion of the visible spectrum lying between yellow and blue, evoked in the human observer by radiant energy with wavelengths of approximately 490 to 570 nanometers; any of a group of colors that may vary in lightness and saturation and whose hue is that of the emerald or somewhat less yellow than that of growing grass; one of the additive or light primaries; one of the psychological primary hues. Shown is a green balloon.