erythro-, erythr-, ereuth-

(Greek: the color red, ruddy; blushing)

1. A chromatopsia in which objects appear tinged with red.
2. An abnormality of vision in which all objects appear to be tinged with red.
zooerythrine (s) (noun) (no pl)
A red pigment in bird feathers: When Janet noticed an American male cardinal in her backyard, she thought that the red plumage must be due to zooerythrine!