mediastinum

 
Pronunciation: /ˌmiːdɪəˈstʌɪnəm/

noun (plural mediastina /-nə/)

Anatomy
  • a membranous partition between two body cavities or two parts of an organ, especially that between the lungs.

Derivatives

mediastinal

adjective

Origin:

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