Yellow

1. Color. The hue of that portion of the visible spectrum lying between orange and green, evoked in the human observer by radiant energy with wavelengths of approximately 570 to 590 nanometers; any of a group of colors of a hue resembling that of ripe lemons and varying in lightness and saturation; one of the subtractive primaries; one of the psychological primary hues. She wore a yellow dress to the dinner.
2. Like a coward; ignobly fearful. In the face of danger, he came to be known as yellow.