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sphaeridium

The English word “sphaeridium” has 2 meanings listed here.

noun

  1. Synonym of capitulum.
  2. A tiny, spherical appendage, generally formed in masses to form a kind of sense organ, found on the test of most sea urchins. It is generally supposed to be an olfactory organ, or for equilibrium, similar to the otolith

Etymology

From Ancient Greek σφαιρίδιον (sphairídion, “sphere (diminutive form)”), by surface analysis, sphero- + -idium.

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