Jellyfish definitions

jĕl'ē-fĭsh'
Any of various free-swimming, mostly marine cnidarians (esp. class Scyphozoa) with a body made up largely of jellylike substance and shaped like an umbrella: it has long, hanging tentacles with stinging cells on them.
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A weak-willed person.
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Any of numerous usually free-swimming marine cnidarians of the class Scyphozoa, characteristically having a gelatinous, tentacled, often bell-shaped medusa stage as the dominant phase of its life cycle.
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Any of various similar or related cnidarians.
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One who lacks force of character; a weakling.
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Any of numerous usually free-swimming marine cnidarians of the class Scyphozoa, characteristically having a gelatinous, tentacled, often bell-shaped medusa stage as the dominant phase of its life cycle.
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Any of various similar or related cnidarians.
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(zoology) An almost transparent aquatic being; any one of the acalephs, especially one of the larger species, having a jellylike appearance.
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Origin of jellyfish

From jelly +‎ fish.