jel·ly·fish

[jel-ee-fish]
noun, plural (especially collectively) jel·ly·fish (especially referring to two or more kinds or species) jel·ly·fish·es.
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:
1700–10; 1910–15 for def 2; jelly + fish

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Collins
World English Dictionary
jellyfish (ˈdʒɛlɪˌfɪʃ) [Click for IPA pronunciation guide]
 
n , 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 10th Edition
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00:10
Jellyfish is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
American Heritage
Medical Dictionary

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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Example sentences
In addition to wine-marinated chicken, braised sliced beef and jellyfish, there
  are three really unusual dishes.
Already, human impacts on the ocean are large, from spurring jellyfish to
  dominate to boosting algae blooms and dead zones.
Few marine creatures are as mysterious and intimidating as jellyfish.
Then, frustrated with the hunt, he turned to jellyfish.
Images for jellyfish
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