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/ˌmiːdi.əˈstaɪnəm/ · noun
(anatomy) The region in mammals between the pleural sacs, containing the heart and all of the thoracic viscera except the lungs..
Use mediastinum when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Mediastinum means (anatomy) The region in mammals between the pleural sacs, containing the heart and all of the thoracic viscera except the lungs..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use mediastinum where its definition matches the intended context.
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