me·di·as·ti·num (m  d- -st  nm)n. pl. me·di·as·ti·na (-n ) The region in mammals between the pleural sacs, containing the heart and all of the thoracic viscera except the lungs. [New Latin mediast num, from neuter of Medieval Latin mediastnus, medial, from Latin, inferior servant, drudge (anatomical sense probably influenced by Latin intestnum, intestine), from medius, middle; see medhyo- in Indo-European roots.]me di·as·tinal (-nl) adj. |
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