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
From the M-W Editors
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1979
First Known Use of barrel sponge
1979
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