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jellyfish

[jel-ee-fish] /ˈdʒɛl iˌfɪʃ/
noun, plural (especially collectively) jellyfish (especially referring to two or more kinds or species) jellyfishes.
1.
any of various marine coelenterates of a soft, gelatinous structure, especially one with an umbrellalike body and long, trailing tentacles; medusa.
2.
Informal. a person without strong resolve or stamina; an indecisive or weak person.
Origin
1700-1710
1700-10; 1910-15 for def 2; jelly + fish
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for jelly fish

jellyfish

/ˈdʒɛlɪˌfɪʃ/
noun (pl) -fish, -fishes
1.
any marine medusoid coelenterate of the class Scyphozoa, having a gelatinous umbrella-shaped body with trailing tentacles
2.
any other medusoid coelenterate
3.
(informal) a weak indecisive person
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for jelly fish

jellyfish

n.

popular name of the medusa and similar sea-creatures, 1796, from jelly (n.) + fish (n.). Earlier it had been used of a type of actual fish (1707).

Online Etymology Dictionary, © 2010 Douglas Harper
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jelly fish in Medicine

jellyfish jel·ly·fish (jěl'ē-fĭsh')
n. pl jellyfish or jel·ly·fish·es

  1. Any of numerous marine coelenterates of the class Scyphozoa, some poisonous species of which notably the Portuguese man-of-war, produce a toxin that can be injected into the skin by nematocysts on the tentacles, causing linear wheals.

  2. Any of various similar or related coelenterates.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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