vagusEnglishOxford New American Dictionaryvagus /ˈvāɡəs, ˈveɪɡəs / ▸ noun (plural vagi /ˈvāɡī, , ˈveɪɡaɪ , ˈvāˌjī, , ˈveɪˌdʒaɪ , ˈvāˌɡē, , ˈveɪˌɡi , ˈvāˌjē, ˈveɪˌdʒi /) (also vagus nerve) Anatomy each of the tenth pair of cranial nerves, supplying the heart, lungs, upper digestive tract, and other organs of the chest and abdomen. – ORIGIN mid 19th century : from Latin (see vague).