1. 
   Clitellum
   The clitellum is a thickened glandular section of the body wall in earthworms and leeches, that secretes a viscid sac in which the eggs are deposited. It is present about {convert|2|cm} behind the anterior end of the body (around 14th, 15th and 16th segments). A clitellum is part of the reproductiv...
   Found op http://en.wikipedia.org/wiki/Clitellum
   
   
2. 
   clitellum
   In annelids, a swelling of the body towards the head of the animal, where the gonads are located. Both oligochaetes and leeches have a clitellum.
   Found op http://www.ucmp.berkeley.edu/glossary/glossary_7.html
   
   
3. 
   clitellum
   (from the article `reproductive system, animal`) Sexually mature oligochaetes have a clitellum, which is a modification of a section of the body wall consisting of a glandular, saddlelike thickening ... ...segmented and has conspicuous segmental lines. The prostomium is usually a simple lobe overhan...
   Found op http://www.britannica.com/eb/a-z/c/98
   
   
4. 
   clitellum
   1) Barrel-shaperd swelling that covers segments 31-37
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/clitellum/1
   
   

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