jellyfish definition

  • noun:
    • Any of many usually free-swimming marine coelenterates regarding the course Scyphozoa, characteristically having a gelatinous, tentacled, often bell-shaped medusoid stage as dominant phase of its life period.
    • some of different similar or related coelenterates.
    • Informal a person who lacks force of character; a weakling.
    • Practically transparent aquatic being; any one of the acalephs, especially among the bigger types, having a jellylike look.
    • anybody regarding the acalephs, esp. among the bigger types, having a jellylike look. See medusa and acaleph.
    • a favorite name of numerous types of acalephs, medusas, sea-blubbers, or sea-nettles: so called from the smooth, gelatinous construction.
    • any one of numerous often marine and free-swimming coelenterates that constitute the intimately reproductive types of hydrozoans and scyphozoans
    • large siphonophore having a bladderlike float and stinging tentacles

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