Hydractinian Hy`drac*tin"i*an, n. [See {Hydra}, and {Actinia}.] (Zo["o]l.) 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}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • hydractinian — noun A marine hydroid of the genus Hydractinia or a closely related genus …   Wiktionary

  • hydractinian — hy·drac·tin·i·an …   English syllables

  • hydractinian — adjective or noun see hydractinia …   Useful english dictionary

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