glass sponge

noun

Definition of glass sponge 

: any of a class (Hexactinellida synonym Hyalospongiae) of chiefly deep-water siliceous marine sponges with 6-rayed spicules and a skeleton often resembling glass when dried

First Known Use of glass sponge

1875, in the meaning defined above

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The first known use of glass sponge was in 1875

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