- 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. Source: opted
- 2. 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. Source: webster
- 3. Any species or marine hydroids, of the genus Hydractinia andallied genera. These hydroids form, by their rootstalks, a firm,chitinous coating on shells and stones, and esp. on spiral shellsoccupied by hermit crabs. See Illust. of Athecata. Source: adambom
- 4. hydractinian (plural hydractinians) (biology) A marine hydroid of the genus Hydractinia or a closely-related genus Source: ecdict
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hydractinian
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hydroidsgenusshellsmarineathecatachitinouscoatingcrabsESPfirmformgenerahermitseespeciesspiralstonestheiralliedoccupiedbiologyhydroidplural
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