jellyfish

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jel·ly·fish

(jel'ē-fish),
Marine coelenterates (class Hydrozoa) including some poisonous species, notably Physalia, the Portuguese man-of-war; toxin is injected into the skin by nematocysts on the tentacles, causing linear wheals.
Synonym(s): jelly (2)

jellyfish

(jĕl′ē-fĭsh′)
n. pl. jellyfish or jelly·fishes
a. 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. Also called true jellyfish.
b. Any of various similar or related cnidarians.

jel·ly·fish

(jel'ē-fish)
Marine coelenterates, including some poisonous species; toxin is injected into the skin by nematocysts on the tentacles, causing linear wheals.

jellyfish

  1. any large medusa of the class Scyphozoa.
  2. the medusoid stages of any coelenterate.