Last Updated
：2025/11/25
hydractinian
（ plural ）
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(biology) A marine hydroid of the genus Hydractinia or a closely-related genus
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hydractinian
A single hydractinian settled on the hermit crab's shell, creating a miniature reef of living polyps.
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A single hydractinian settled on the hermit crab's shell, creating a miniature reef of living polyps.
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