Definition of parasympathetic nervous system
: the part of the autonomic nervous system that contains chiefly cholinergic fibers, that tends to induce secretion, to increase the tone and contractility of smooth muscle, and to slow heart rate, and that consists of a cranial and a sacral part — compare sympathetic nervous system
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Merriam-Webster unabridged
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Time Traveler for parasympathetic nervous system
The first known use of parasympathetic nervous system was circa 1934
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