Thrombosis (noun)

The formation of a blood clot within a blood vessel, obstructing the flow of blood through the circulatory system.

Origin:

Late 19th century: from greek thrombos "clump" + -osis.

Examples:

1. She was diagnosed with thrombosis in her left leg.
2. The thrombosis in his brain caused a stroke.
3. The thrombosis in his heart caused a heart attack.
4. The doctor said that the thrombosis was caused by a genetic disorder.
5. He was placed on blood thinners to prevent thrombosis from recurring.