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hydractinian

Hydractinian is a 12 letter word which starts with the letter H and ends with the letter N for which we found 1 definitions.

Definition
(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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