preganglionic
adjective
pre·gan·gli·on·ic ˌprē-ˌgaŋ-glē-ˈä-nik 
: proximal to a ganglion
specifically : of, relating to, or being a usually myelinated axon arising from a cell body in the central nervous system and terminating in an autonomic ganglion compare postganglionic
Word History
First Known Use
1892, in the meaning defined above
Medical Definition
preganglionic
adjective
pre·gan·gli·on·ic -ˌgaŋ-glē-ˈän-ik
: anterior or proximal to a ganglion
specifically : being, affecting, involving, or relating to a usually myelinated efferent nerve fiber arising from a cell body in the central nervous system and terminating in an autonomic ganglion compare postganglionic