n. [ Gr. &unr_; color + &unr_; to show. ] (Physiol.) A general name for the several coloring matters, red, green, yellow, etc., present in the inner segments in the cones of the retina, held in solution by fats, and slowly decolorized by light; distinct from the photochemical pigments of the rods of the retina. [ 1913 Webster ]

n. [ Gr. &unr_; color + fe`rein to bear. ] (Chem.) Any chemical group or residue (as NO2; N2; or O2) which imparts some decided color to the compound of which it is an ingredient. [ 1913 Webster ]

n. [ Gr. &unr_; color + fe`rein to bear. ] (Chem.) Any chemical group or residue (as NO2; N2; or O2) which imparts some decided color to the compound of which it is an ingredient. [ 1913 Webster ]