hydractinian definition

  • noun:
    • A marine hydroid associated with genus Hydractinia or a closely-related genus
    • Any species or marine hydroids, regarding the genus Hydractinia and allied genera. These hydroids form, by their particular rootstalks, a strong, chitinous layer on shells and stones, and esp. on spiral shells occupied by hermit crabs. See Illust. of athecata.

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  • Hypernym for "hydractinian"
  • Variant for "hydractinian"
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