Purple is a color in between red and blue.(noun)
A color between red and blue is an example of purple.
The definition of purple is something that is a color that combines red and blue.(adjective)
A dress that is a color between red and blue is an example of a purple dress.
See purple in Webster's New World College Dictionary
Origin: ME purpel < OE (Northumbrian) purpl(e), dissimilated var. of WS purpur(e) < L purpura, purple < Gr porphyra, shellfish yielding purple dye
See purple in American Heritage Dictionary 4
Origin: Middle English
Origin: , from Old English purpul
Origin: , from purpure, purple garment
Origin: , from Latin purpura, shellfish yielding purple dye, purple cloth, purple
Origin: , from Greek porphurā.
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