# thrombosis

/θɹɑmˈboʊsəs/ (US) · /θɹəmbˈəʊsɪs/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/thrombosis
Updated: 2026-05-20

## Definition

a medical condition where a blood clot forms inside a blood vessel. This can block the flow of blood and cause serious health problems if it moves to another part of the body.

For teachers: the formation of a blood clot within a blood vessel, obstructing the flow of blood through the circulatory system. Often used in clinical contexts to describe both the clot itself and the resulting condition.

## Examples

- The doctor warned him about the risk of deep vein thrombosis after the long flight.
- Patients who sit for long periods without moving are at a higher risk of developing thrombosis in their legs.

---

From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.