Definition of mediastinum in English:


Syllabification: me·di·as·ti·num
Pronunciation: /ˌmēdēəˈstīnəm

noun (plural mediastina /-əˈstīnə/)

  • A membranous partition between two body cavities or two parts of an organ, especially that between the lungs.
    More example sentences
    • The tumor, which is often but not always associated with cystic lung lesions, may arise in pulmonary parenchyma, the mediastinum, and pleura.
    • On the lateral radiograph there appeared to be herniation of the left lung through the anterior mediastinum.
    • The left main bronchus was exposed at the posterior mediastinum and separated from connective tissue.



Pronunciation: /-ˈstīnl/
More example sentences
  • One patient had extensive cervical, posterior mediastinal, and abdominal lymphadenopathy.
  • Two patients presented with masses in the upper lobe of the right lung, simulating posterior mediastinal tumors.
  • All men with mediastinal lung masses require a careful testicular examination.


late Middle English: neuter of medieval Latin mediastinus 'medial', based on Latin medius 'middle'.

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