Webster's English Dictionary

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jellyfish

jel.ly.fish \'jel-e--.fish\ n 1a: a free-swimming marine coelenterate that 
   is the sexually reproducing fo rm of a hydrozoan or scyphozoan and has a 
   nearly transparent saucer-shaped body and extensile marginal tentacles 
   studded with stinging cells 1b: SIPHONOPHORE  1c: CTENOPHORE  2: a person 
   lacking backbone or firmness