Purple is a shade that's a mixture of red and blue. If you are eating a grape Popsicle, get ready to spend a while with a purple tongue and lips.
The Greek root of purple is porphyra, which was the name of the shellfish from which purple dye was made. Long ago, only royalty could wear — and afford the dye for — purple clothing. If the setting sun purples the sky, the light is making the horizon appear to be colored purple, just as a bruise purples your skin. Purple prose is a literary term that refers to overly flowery or exaggerated writing.