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hydrozoa n. 水螅虫类 水螅虫类 Hydrozoa n 1: coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes [ synonym: { Hydrozoa}, { class Hydrozoa}] Hydrozoa \ Hy` dro* zo" a\, n. pl. [ NL., fr. E. hydra Gr. zo^, on an animal.] ( Zool.) The Acaleph[ ae]; one of the classes of c[ oe] lenterates, including the Hydroidea, Discophora, and Siphonophora. [ 1913 Webster]
Hydrozoon \ Hy` dro* zo"[" o] n\, n.; pl. L. { Hydrozoa}, E. { Hydrozo[" o] ns}. [ NL.] ( Zool.) One of the Hydrozoa. [ 1913 Webster]
{ Molluscoidea}, including Brachiopoda and Bryozoa. { Mollusca}, including Cephalopoda, Gastropoda, Pteropoda, Scaphopoda, Lamellibranchiata or Acephala. { Echinodermata}, includingHolothurioidea, Echinoidea, Asterioidea, Ophiuroidea, andCrinoidea. { C[ oe] lenterata}, including { Anthozoa} or { Polyps}, { Ctenophora}, and { Hydrozoa} or Acalephs. { Spongiozoa} or{ Porifera}, including the sponges. { Protozoa}, including { Infusoria} and { Rhizopoda}. Fordefinitions, see these names in the Vocabulary. [ 1913 Webster] Animalcular
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