radiole.
The spine of a sea urchin.
Meaning & usage
The spine of a sea urchin.
A heavily ciliated feather-like tentacle occurring in clusters on the crowns of certain tubeworms, especially those of the order Canalipalpata (fan-head worms), used for feeding and respiration.
Where this word comes from
From Late Latin radiolus (“a fossil echinoid’s spine”), from Latin radius (“rod, staff”) (possibly ultimately from Proto-Indo-European *reh₁t- (“beam, pole, post”)) + -olus (diminutive suffix) (ultimately from Proto-Indo-European *-lós). The word first appears in the works of Scottish natural historian and marine zoologist Charles Wyville Thomson (1830–1882).
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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.