Red  —adj. (redder, reddest) 1 of the colour ranging from that of blood to deep pink or orange. 2 flushed in the face with shame, anger, etc. 3 (of the eyes) bloodshot or red-rimmed. 4 (of the hair) reddish-brown, tawny. 5 having to do with bloodshed, burning, violence, or revolution. 6 colloq. Communist or socialist. 7 (red) hist. Russian, soviet. —n. 1 red colour or pigment. 2 red clothes or material. 3 colloq. Communist or socialist.  in the red in debt or deficit.  reddish adj. Redness n. [old english]