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    Word: Hydractinian

    ID Word Wordtype Definition
    75010 Hydractinian n. Any species or marine hydroids, of the genus Hydractinia and allied genera. These hydroids form, by their rootstalks, a firm, chitinous coating on shells and stones, and esp. on spiral shells occupied by hermit crabs. See Illust. of Athecata.


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    Fusion | Obolo | Overthwart | Quell | Beamless |