of or pertaining to a vagus nerve.

1850–55; vag(us) + -al1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vagal (ˈveɪɡəl)
anatomy of, relating to, or affecting the vagus nerve: vagal inhibition

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

vagal va·gal (vā'gəl)
Of or relating to the vagus nerve.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
They need to test whether or not the vagal nerve is the trigger or if the brain is the trigger to the vagal nerve.
During stress, vagal tone decreases, allowing the heart to speed up and the body to handle the stressor.
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