Bible Dictionaries
Hydractinian
Webster's Dictionary
(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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Bibliography Information
Webster, Noah. Entry for 'Hydractinian'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/h/hydractinian.html. 1828.