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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}, including
Holothurioidea, Echinoidea, Asterioidea, Ophiuroidea, and
Crinoidea. {C[oe]lenterata}, including {Anthozoa} or {Polyps},
{Ctenophora}, and {Hydrozoa} or Acalephs. {Spongiozoa} or
{Porifera}, including the sponges.
{Protozoa}, including {Infusoria} and {Rhizopoda}. For
definitions, see these names in the Vocabulary.
[1913 Webster] Animalcular


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