Sphaeridia

Sphaeridia
Sphaeridium Sph[ae]*rid"i*um, n.; pl. {Sph[ae]ridia}. [NL., fr. Gr. ??? a sphere.] (Zo["o]l.) 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]

The Collaborative International Dictionary of English. 2000.

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  • centrechinoida — (ˌ)sen.ˌtrekə̇ˈnȯidə noun plural Usage: capitalized Etymology: New Latin, from Centrechinus + oida : a large order of sea urchins having peristomial gills, sphaeridia, and an apically located anus compare cidaroida, exocycloida …   Useful english dictionary

  • cidaroida — ˌsidəˈrȯidə noun plural Usage: capitalized Etymology: New Latin, from Cidaris + oida : the oldest surviving order of sea urchins containing the most primitive of living forms, all lacking peristomial gills and sphaeridia but having an apically… …   Useful english dictionary

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