Etymology
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jellyfish (n.)

also jelly-fish, popular name of the medusa and similar sea-creatures, 1796, from jelly (n.) + fish (n.). So called for its soft structure. Figuratively, "person of weak character," 1883. Earlier it had been used of a type of actual fish (1707).

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Definitions of jellyfish

jellyfish (n.)
large siphonophore having a bladderlike float and stinging tentacles;
Synonyms: Portuguese man-of-war / man-of-war
jellyfish (n.)
any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans;
From wordnet.princeton.edu

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