Bible Dictionaries
Mediastinum
Webster's Dictionary
(n.) A partition; a septum; specifically, the folds of the pleura (and the space included between them) which divide the thorax into a right and left cavity. The space included between these folds of the pleura, called the mediastinal space, contains the heart and gives passage to the esophagus and great blood vessels.
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Bibliography Information
Webster, Noah. Entry for 'Mediastinum'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/m/mediastinum.html. 1828.