1. 
   sphaeridium
   <marine biology, zoology> A peculiar sense organ found upon the exterior of most kinds of sea urchins, and consisting of an oval or sherical head surmounting a short pedicel. It is generally supposed to be an olfactory organ. ... Origin: NL, fr. Gr. A sphere. ... (20 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?sphaeridium
   
   
2. 
   Sphaeridium
   • (n.) A peculiar sense organ found upon the exterior of most kinds of sea urchins, and consisting of an oval or sherical head surmounting a short pedicel. It is generally supposed to be an olfactory organ.
   Found op http://thinkexist.com/dictionary/meaning/sphaeridium/
   
   
3. 
   Sphaeridium
   Sphaeridium is a genus of water scavenger beetles of the family Hydrophilidae. They live in fresh cow dung.
   Found op http://www.probertencyclopaedia.com/browse/BSB.HTM
   
   

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