Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of sphaeridium is as below...

Sphaeridium :: 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..

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