Real Dictionary

red
any of a group of colours, such as that of a ripe tomato or fresh blood, that lie at one end of the visible spectrum, next to orange, and are perceived by the eye when light in the approximate wavelength range 740–620 nanometres falls on the retina. Red i
any of a large group of nitrogenous compounds of high molecular weight that are essential constituents of all living organisms. They consist of one or more chains of amino acids linked by peptide bonds and are folded into a specific three-dimensional shap
exhibiting or having the property of fluorescence [...]
the emission of light or other radiation from atoms or molecules that are bombarded by particles, such as electrons, or by radiation from a separate source. The bombarding radiation produces excited atoms, molecules, or ions and these emit photons as they
colour: Something that is red is the colour of blood or fire.