Meaning of three-color

three-col•or

Pronunciation: (thrē'kul"ur), [key]
— adj.
  1. having or characterized by the use of three colors.
  2. noting or pertaining to a photomechanical process for making reproductions of paintings, artwork, etc., usually by making three printing plates, each corresponding to a primary color, by the halftone process, and printing superimposed impressions from these plates in three correspondingly colored inks.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.