A florid, bright-red, flushed complexion. It may be caused by dilation of blood vessels, or, less commonly, by polycythaemia.
A condition of fullness of the blood vessels in a particular part or in the whole body. This results in a ?orid, red appearance of the affected area, particularly the face. The volume of blood may be increased (POLYCYTHAEMIA) or the blood vessels beneath the skin may be dilated. Plethoric lung ?elds are seen on X-rays of patients with left-to-right shunts through the heart wall (see SEPTAL DEFECT).
n. any excess of any bodily fluid, especially blood (see hyperaemia). —plethoric adj.
(polycythaemia rubra vera, Vaquez–Osler disease) a disease in which the number of red cells in the blood is greatly increased (see also polycythaemia). There is often also an increase in the numbers of white blood cells and platelets. Symptoms include headache, thromboses, *cyanosis, *plethora, and itching. Polycythaemia vera may be treated by blood-letting, but more severe cases may need to be treated with cytotoxic drugs. The cause of the disease is not known.... polycythaemia vera