Webster's Online Dictionary
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Definition: HYDRACTINIAN

Part of Speech Definition
Noun 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 esp. on spiral shells occupied by hermit crabs.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "Hydractinian" was first used in popular English literature: sometime before 1914. (references)

Note: Hydractinian \Hy`drac*tin"i*an\, noun. [See Hydra, and Actinia.]. (references)

Definition: HYDRACTINIAN

Part of SpeechDefinition
Noun1. 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.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "HYDRACTINIAN" was first used in popular English literature: sometime before 1914. (references)

Note: Hydractinian \Hy`drac*tin"i*an\, noun. [See Hydra, and Actinia.]. (references)