Etymology
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vagus (n.)

plural vagi, 1840, "pneumogastric nerve," the long, widely distributed nerve from the brain to the upper body, from Latin vagus "wandering, straying" (see vague).

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Definitions of vagus

vagus (n.)
a mixed nerve that supplies the pharynx and larynx and lungs and heart and esophagus and stomach and most of the abdominal viscera;
Synonyms: vagus nerve / nervus vagus / pneumogastric / pneumogastric nerve / tenth cranial nerve / wandering nerve
From wordnet.princeton.edu