Sphae*rid"i*um (?), n.; pl. Sphaeridia (#). [NL., fr. Gr. a sphere.] Zool.

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.


© Webster 1913.

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