RGB noun4 •[before a noun] Something extending across the RGB color space; (especially) something having a wide variety of vivid colors.You're about to get lost in the RGB forest and make sensory associations you would never think of in Oscar López Rocha's animation Synesthetic Locked. — 2013 •Initialism of red, green, blue; a color model in which colors are represented by adding varying amounts of red, green, and blue light. •(slang) RGB lighting; lights (especially LEDs) able to display a wide range of colors by being able to individually adjust the strength of the red, green, and blue channels.The earcups are light aluminum with a classy silver look, accented by an RGB-lit Corsair logo in the center. — 2021 •Initialism of red-giant branch. A classification of stars.