noun
a free-swimming marine coelenterate with a jellylike bell- or saucer-shaped body that is typically transparent and has stinging tentacles around the edge
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The jellyfish is a fascinating marine creature with a gelatinous body and tentacles.
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I saw a jellyfish while snorkeling at the beach today.
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Dude, did you see that huge jellyfish in the water? It was gnarly!
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Her thoughts drifted like jellyfish, floating aimlessly in her mind.