n, pl  -glia  also  -gli*ons  1  :  a small cystic tumor (as on the back of the wrist) containing viscid fluid and connected either with a joint membrane or tendon sheath  2  :  a mass of nerve tissue containing nerve cells  a  :  an aggregation of such cells forming an enlargement upon a nerve or upon two or more nerves at their point of junction or separation  b  :  a mass of gray matter within the brain or spinal cord  :  NUCLEUS 2 - see BASAL GANGLION  .
 
 
 
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