Webster's English Dictionary

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ganglion

gan.gli.on \'gan-gle--*n\ \-gle--*\ \'gan-gle--*-.na-t-*d\ 
   \.gan-gle--'a:n-ik\ n or gan.glia also ganglions [LL, fr. Gk] pl  1a: a 
   small cystic tumor connected either with a joint membrane or tendon s heath 
   1b: a mass of nerve tissue containing nerve cells external to the brain or  
   spinal cord; also : NUCLEUS 2: a focus of strength or energy  - 
   gan.gli.on.at.ed aj