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.

Definition of Hydractinian

1. Noun. (biology) A marine hydroid of the genus ''Hydractinia'' or a closely-related genus ¹

¹ Source: wiktionary.com

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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