Abnormal, diffuse, extravascular accumulation of fluid in the pulmonary tissues and air spaces due to changes in hydrostatic forces in the capillaries or to increased capillary permeability (Dorland, 28th ed)
condition, usually acute, but sometimes chronic, where fluid builds up in the lungs This often occurs as a response to left ventricular failure in ischemic heart disease, hypertension, or aortic valve disease