aganglionic
/ˌeɪɡaŋɡlɪˈɒnɪk/adjective
1 Anatomy and Zoology. Lacking a ganglion or ganglia.
2 Pathology. Of a part of the gastrointestinal tract: lacking ganglion cells normally present within the wall.
Origin
Mid 19th century; earliest use found in Marshall Hall (1790–1857), physician and neurophysiologist. From a- + ganglionic.