amyelinic
/ˌæmɪˈlɪnɪk/Definitions
1. adjective
relating to or characterized by the absence of myelin, a fatty substance surrounding nerve fibers.
“The amyelinic condition has been linked to several neurological disorders.”
2. noun
a condition or state characterized by the absence of myelin.
“The patient’s amyelinic symptoms were causing severe nerve damage.”