Wiktionary:Word of the day/May 20

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Word of the day for May 20
radiole n
  1. (zoology) The spine of a sea urchin. [from late 19th c.]
  2. (zoology) A heavily ciliated feather-like tentacle occuring in clusters on the crowns of certain tubeworms, especially those of the order Canalipalpata (the fan-head worms), used for feeding and respiration.
PointingHand.svg Today is European Maritime Day, which seeks to raise European citizens’ awareness of the seas and their importance.
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