
1) Cnidarian 2) Coelenterate 3) Hydroid
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https://www.crosswordclues.com/clue/hydrozoan

1) Hydroid 2) Planula 3) Sertularian 4) Siphonophore
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https://www.crosswordclues.com/clue/hydrozoan

[
n] - colonial coelenterates having the polyp phase dominant
Found on
http://www.webdictionary.co.uk/definition.php?query=hydrozoan

hydrozoan 1. Any freshwater or marine coelenterate of the class Hydrozoa, including free-swimming or attached types, as the hydra, in which one developmental stage, either the polyp or medusa, is absent, and colonial types, as the Portuguese man-of-war, in which both medusa and polyp stages are present in a single colony. 2. Of, relating to, or be...
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http://www.wordinfo.info/words/index/info/view_unit/1009/14
hydroid noun colonial coelenterates having the polyp phase dominant
Found on
https://www.encyclo.co.uk/local/20974

Freshwater or marine coelenterates of the class Hydrozoa, such as the Portuguese man-of-war, hydras, etc.
Found on
https://www.encyclo.co.uk/local/21411

any freshwater or marine coelenterate of the class Hydrozoa, including free-swimming or attached types, as the hydra, in which one developmental stage, either the polyp or medusa, is absent, and colonial types, as the Portuguese man-of-war, in which both medusa and polyp stages are present in a single colony.
Found on
https://www.infoplease.com/dictionary/hydrozoan
No exact match found.