Marine-snow meaning

Particles of mostly organic debris, such as dead or decomposed organisms, fecal matter, and sand, that drift downward through the ocean from the upper levels, serving as a food source for a variety of organisms inhabiting the deeper regions where sunlight does not reach.
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(marine biology) Sinking organic detritus in the ocean.
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Origin of marine-snow

  • Coined by William Beebe.

    From Wiktionary