pur'ple

Of a color more or le resembling both blue and red (including violet); as a n., such a color or a substance po e ing it. retinal p., visual p. A pigmentary photochemical substance, secreted from the hexagonal pigment epithelium of the retina and contained in the external segments of the rods. There is none in the cones. When the eyes are kept for a long time in darkne , it becomes abundant, but is bleached on exposure to light. [Lat., purpure us.~\ purpura A cutaneous (pur'pu-rah). affection Syn.: land scurvy. characterized by hemorrhages into the skin. It is not a disease, but a symptom of various disturbances, and when used without qualification signifies a hemorrhagic eruption. p. hemorrhagic a. Very severe or extensive p. or morbus maculosus Werlhofii. p. rheumatic a. P. appearing in the course of an infective arthritis. p. symptomatic a. P: appearing in eruptive fevers. [Lat., purpura, purple.]