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A free-swimming aquatic creature. It starts life as a larva, which attatches itself to a rock or other solid substance and develops into a polyp; eventually the polyp grows into the familiar bell-shaped organism. Most jellyfish have tentacles and a basic nervous system, though they lack more complicated organs, and they are allegedly composed of about 95% water. They usually catch their prey by brushing potential victims with their poison-spouting, long tentacles, which can be anywhere from inches to several feet long. Pl. jellyfish Slang: various sex acts.
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