mediastinum

noun
me·​di·​as·​ti·​num | \ ˌmē-dē-ə-ˈstī-nəm How to pronounce mediastinum (audio) \
plural mediastina\ ˌmē-​dē-​ə-​ˈstī-​nə How to pronounce mediastina (audio) \

Definition of mediastinum

: the space in the chest between the pleural sacs of the lungs that contains all the tissues and organs of the chest except the lungs and pleurae also : this space with its contents

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Other Words from mediastinum

mediastinal \ ˌmē-​dē-​ə-​ˈstī-​nᵊl How to pronounce mediastinal (audio) \ adjective

Examples of mediastinum in a Sentence

Recent Examples on the Web Limited-stage disease is used to describe lung cancer that’s only found within one lung, and may be found in the mediastinum between the lungs. Amanda Macmillan, Health.com, "The Stages of Lung Cancer, Explained," 23 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'mediastinum.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of mediastinum

15th century, in the meaning defined above

History and Etymology for mediastinum

New Latin, from Medieval Latin, neuter of mediastinus medial, from Latin medius

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Time Traveler for mediastinum

Time Traveler

The first known use of mediastinum was in the 15th century

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Cite this Entry

“Mediastinum.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/mediastinum. Accessed 25 January 2020.

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More Definitions for mediastinum

mediastinum

noun
me·​di·​as·​ti·​num | \ ˌmēd-ē-ə-ˈstī-nəm How to pronounce mediastinum (audio) \
plural mediastina\ -​nə How to pronounce mediastina (audio) \

Medical Definition of mediastinum

1 : the space in the chest between the pleural sacs of the lungs that contains all the viscera of the chest except the lungs and pleurae also : this space with its contents

More from Merriam-Webster on mediastinum

Britannica.com: Encyclopedia article about mediastinum

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