parasympathetic

Short definition from Wiktionary

Adjective

1. 1
   Of or relating to the part of the autonomic nervous system that inhibits or opposes the effects of the sympathetic nervous system. It consists of nerves arising from the brain and the lower end of the spinal cord and supplying the internal organs, blood vessels, and glands.

Noun

1. 1
   A parasympathetic nerve.
2. 2
   Ellipsis of parasympathetic nervous system.