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
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Merriam-Webster unabridged
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Time Traveler for glass sponge
The first known use of glass sponge was in 1875
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