Category:Sphaeridium

Sphæ*rid"i*um, n.; pl. Sphæridia. Etym: [nl., fr. Gr. (zoöl.)

Defn: 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.