Lexic.us

Definition of Hydractinian

1. 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.

Medical Definition of Hydractinian

1. 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 especially. On spiral shells occupied by hermit crabs. See: Hydra, and Actinia. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Hydractinian

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