an ornament sculptured or embossed in low relief, as a cameo.
Optics. a composite picture printed in two colors that produces a three-dimensional image when viewed through spectacles having lenses of corresponding colors.
(photog) a stereoscopic picture consisting of two images of the same object, taken from slightly different angles, in two complementary colours, usually red and cyan (green-blue). When viewed through spectacles having one red and one cyan lens, the images merge to produce a stereoscopic sensation
anything cut to stand in low relief, such as a cameo