Standard Lemma guide

mediastinum

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • /ˌmiːdi.əˈstaɪnəm/

1

noun

Meaning 1

The region in mammals between the pleural sacs, containing the heart and all of the thoracic viscera except the lungs.

Definition source: English Wiktionary via Wiktextract

Topics: anatomy, medicine, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: cavity, bodily cavity, cavum

History

Etymology

From New Latin mediastīnum, from Medieval Latin mediastīnus (“middling; middle”), from Latin mediastīnus (“a common servant”).

Across languages

Translations

10 source translations are retained for this English entry.

  • Armenian: միջնորմ (miǰnorm) — the region in mammals
  • Catalan: mediastí — the region in mammals
  • Chinese Mandarin: 縱隔 /纵隔 (zònggé) — the region in mammals
  • Finnish: välikarsina — the region in mammals
  • French: médiastin — the region in mammals
  • German: Mediastinum — the region in mammals
  • Hungarian: gátor — the region in mammals
  • Italian: mediastino — the region in mammals
  • Russian: средосте́ние (sredosténije) — the region in mammals
  • Spanish: mediastino — the region in mammals