Definition of glass sponge in English:

glass sponge

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Entry from British & World English dictionary

noun

A deep-water sponge which has a skeleton of intricately shaped spines of silica that may fuse to form a filmy lattice with a glass-like appearance. See also Venus's flower basket.
  • Class Hexactinellida

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Word of the day middlescent
Pronunciation: ˌmidlˈesənt
adjective
middle-aged, but still maintaining youthful interests and activities