from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun 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.
  • noun Any of various similar or related cnidarians.
  • noun Informal One who lacks force of character; a weakling.

from The Century Dictionary.

  • noun A popular name of many kinds of acalephs, medusas, sea-blubbers, or sea-nettles: so called from the soft, gelatinous structure.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Zoöl.) Any one of the acalephs, esp. one of the larger species, having a jellylike appearance. See medusa and acaleph.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun zoology Almost transparent aquatic being; any one of the acalephs, especially one of the larger species, having a jellylike appearance.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans
  • noun large siphonophore having a bladderlike float and stinging tentacles


Sorry, no etymologies found.


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  • The Chironex fleckeri of the chirodropid species, also known as the sea wasp or the box jellyfish, is considered the most deadly jellyfish in the world. 3 Stings from its tentacles cause an erythematous whipped appearance on the skin and may result in blackening and necrosis in the area.

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  • The jellyfish is part of the cnidarians, the family relationship of which is depicted in the figure on the left (click on image to view it in full scale).

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