Hydroidea

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This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

the GNU version of the Collaborative International Dictionary of English
  • noun-plural. An extensive order of Hydrozoa or Acalephæ.
  • The Century Dictionary and Cyclopedia
  • An order or subclass of the class Hydrozoa, approximately equivalent to Hydrophora, and consisting of the eleutheroblastic, gymnoblastic, and calyptoblastic hydrozoans.
  • Variant
    hydroida