sphaeridium.
Synonym of capitulum.
Meaning & usage
Synonym of capitulum.
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
Where this word comes from
From Ancient Greek σφαιρίδιον (sphairídion, “sphere (diminutive form)”), by surface analysis, sphero- + -idium.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.