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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Clitellus  \Cli*tel"lus\,  n.  [NL.,  prob.  fr  L.  clitellae  a 
  packsadle.]  (Zo["o]l.) 
  A  thickened  glandular  portion  of  the  body  of  the  adult 
  earthworm,  consisting  of  several  united  segments  modified  for 
  reproductive  purposes.