Definition: Angiotonia, an abnormality in blood vessels caused by abnormal dilation or rupture of blood vessels or valves that control blood flow to organs like the heart, lungs, and brain. Detailed definition includes: Angiotonia refers to a condition where the blood vessel walls become too thin or inflamed due to damage or inflammation from injury, infection, or certain medications. It's also known as angiogenesis failure; abnormal growth of blood vessels.