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Definition of: jellyfish
Our photo definition of jellyfish 
(jel′ē·fish′) noun plural ·fish or ·fish·es
1. Any of a number of marine coelenterates (classes Hydrozoa and Scyphozoa) of jellylike appearance, and usually umbrella–shaped bodies with trailing tentacles, as the medusa and the Portuguese man–of–war.
2. Colloq. A person without energy, determination, or stamina.
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