MARTINET n. 2 definitions
In military language, a strict disciplinarian; in general, one who lays stress on a rigid adherence to the details of discipline, or to forms and fixed methods. [Hence, the word is commonly employed in a depreciatory sense.]
MEDIASTINE; MEDIASTINUM 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.…