home r Peter Puklus red [red] –noun 1. any of various colors resembling the color of blood; the primary color at one extreme end of the visible spectrum, an effect of light with a wavelength between 610 and 780 nm. 2. something red. 3. (often initial capital letter) a radical leftist in politics, especially a communist. a b c d e f g h i j k l m n o p q r s t u v w x y z red reflection refuge refrigerator removed rescuer reflect rest resignation retro reveal redundant rip-rz