adj, noun ·Uncommon ·Advanced level

Definitions

Noun

1. 1
   Any of various invertebrate animals, such as jellyfish, hydras, sea anemones, corals and formerly sponges and ctenophores that belong to the phylum Cnidaria.

   "A general feature of cnidarians, as I noted above, is their stinging cells."

2. 2
   radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms wordnet

Adjective

1. 1
   Of or relating to a cnidarian.

Synonyms

All synonyms

coelenteratecoelenterate

Example

More examples

"A general feature of cnidarians, as I noted above, is their stinging cells."

Etymology

From translingual Cnidaria + -an, derived from New Latin Cnīdāria, derived from Ancient Greek κνῑ́δη (knī́dē, “sea nettle”).

Related phrases

sea anemone

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.