水螅
3.Any of numerous coelenterates of the class Hydrozoa, including the freshwater hydras, hydroids, hydrocorals, and siphonophores.
6.A horny external covering that encloses the polyp colonies of certain hydrozoans.
9.feathery colony of long-branched stems bearing stalkless paired polyps.
10.A feeding zooid in a hydroid colony having an oral opening surrounded by tentacles.

