What does Parasympathetic nervous system mean in medical term?

Parasympathetic nervous system means: Parasympathetic nervous systems: This is the part of involuntary nerve system that slows the heart beat, increases intestinal and glandular activity and relaxes the sphincter muscle. Together with the sympathetic nervous systems, the parasympathetic nervous is the part of the autonomic nervous.
(in Medical Dictionary)

What else does Parasympathetic nervous system mean?

This is the part of autonomic nervous systems that originates in the brain stem. It also includes the lower portion of the spinal cord.
(in Merlin Dictionary)