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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From jelly + fish. From being an aquatic creature (i.e. fish) that is gelatinous (“jelly”). Despite the name, jellyfish are not biologically classified as fish. The term appeared in the mid-19th century and displaced various older terms such as sea jelly (now much less common), blubber/sea blubber, nettle/sea nettle (both now referring to specific jellyfish species), and, in scientific literature, medusa.
Portuguese man-of-war, man-of-war
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Classic usage
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