
• (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 on
http://thinkexist.com/dictionary/meaning/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 on
http://www.encyclo.co.uk/local/20973

Sphaeridium is a genus of water scavenger beetles of the family Hydrophilidae. They live in fresh cow dung.
Found on
http://www.probertencyclopaedia.com/browse/BSB.HTM
No exact match found.