单词	barrel sponge
释义	barrel sponge noun : 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 Word History First Known Use 1979, in the meaning defined above
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