Sphaeridium

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Sphaeridium \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.


     [1913 Webster]