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barrel sponge

noun
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Definition of barrel sponge

: any of various large, usually cylindrical sponges (genus Xestospongia of the class Demospongiae) found especially on tropical coral reefs
  • I pass over the largest, healthiest barrel sponge I've ever seen—it seems plausible that I could fit inside it …
  • —Scott Edler,  Washington Post,  21 Oct. 2012

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First Known Use of barrel sponge

1979

in the meaning defined above

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