from the GNU version of the Collaborative International Dictionary of English
- adj. a system of nerves and nerve ganglions connected with the alimentary canal, the vascular system, and the glandular organs of most vertebrates, and controlling more or less their actions. The axial part of the system and its principal ganglions and nerves are situated in the body cavity and form a chain of ganglions on each side of the vertebral column connected with numerous other ganglions and nerve plexuses.
Sorry, no etymologies found.