Etymology
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parasympathetic (adj.)

in reference to major divisions of the nervous system, 1905, from para- (1) "beside" + sympathetic.

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Definitions of parasympathetic
1
parasympathetic (n.)
originates in the brain stem and lower part of the spinal cord; opposes physiological effects of the sympathetic nervous system: stimulates digestive secretions; slows the heart; constricts the pupils; dilates blood vessels;
Synonyms: parasympathetic nervous system
2
parasympathetic (adj.)
of or relating to the parasympathetic nervous system;
From wordnet.princeton.edu