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WordReference Random House Unabridged Dictionary of American English © 2024me•di•as•ti•num (mē′dē a stī′nəm),USA pronunciation n., pl. -as•ti•na (-a stī′nə).USA pronunciation [Anat.]- Anatomya median septum or partition between two parts of an organ, or paired cavities of the body.
- Anatomythe partition separating the right and left thoracic cavities, formed of the two inner pleural walls, and, in humans, comprising all the viscera of the thorax except the lungs.
- Neo-Latin; compare mediastīnus of middle class, apparently identical with Latin mediast(r)īnus a low-ranking slave, perh. derivative of medius mid1, though sense and formation unclear
- 1535–45
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