1. cnidarian

noun. radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms.


  • scyphozoan
  • invertebrate
  • jellyfish
  • medusa
  • actinozoan
  • coelenteron
  • polyp
  • medusan
  • anthozoan
  • medusoid
  • Coelenterata
  • phylum Coelenterata
  • Cnidaria
  • hydroid
  • phylum Cnidaria
  • hydrozoan

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Sentences with cnidarian

1. Noun, singular or mass
Living coral are the only species of cnidarian who don't need to catch prey for food, because they get most of their nutrients from symbiotic algae living inside them called zooxanthellae.

2. Adjective
The tiny cnidarian got this name for its ability to regenerate from injury and bud off new individuals from its body.