barrel sponge

English

Noun

barrel sponge (plural barrel sponges)

  1. A sponge of the genus Xestospongia, especially Xestospongia testudinaria.
    • 2012, Caspar Henderson, The Book of Barely Imagined Beings, Granta Books, published 2013, page 29:
      In making use of something as simple as a difference in water speed, barrel sponges are exploiting energy from currents and tides that ultimately derive from the gravitational pull exerted by the Moon and Sun.

References
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