# mediastinum

> English word · Noun · IPA /ˌmiːdi.əˈstaɪnəm/

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

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/mediastinum