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Webster 1913 Edition
Sphaeridium
‖
Sphae-rid′i-um
,Noun.
pl.
Sphaeridia
(#)
. [NL., fr. Gr. [GREEK][GREEK][GREEK] 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.