any system of marking or visual designation that uses specific colors for indicating or simplifying, as on a chart or map or in an industrial plant.
Pronunciation: (kul'ur-kōd"), [key]
—v.t., -cod•ed, -cod•ing.
to distinguish or classify with a color code.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.