barrel sponge

noun

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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The first known use of barrel sponge was in 1979

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