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Hydroidea   Listen
noun
Hydroidea  n. pl.  (Written also Hydroida)  (Zool.) An extensive order of Hydrozoa or Acalephae. Note: This order includes the hydras and the free-swimming hydromedusae, together with a great variety of marine attached hydroids, many of which grow up into large, elegantly branched forms, consisting of a vast number of zooids (hydranths, gonophores, etc.), united by hollow stems. All the zooids of a colony are produced from one primary zooid, by successive buddings. The Siphonophora have also been included in this order by some writers. See Gymnoblastea, Hydromedusa, Gonosome, Gonotheca.






Collaborative International Dictionary of English 0.48







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