Thesaurus: hydroidea
An extensive order of Hydrozoa or Acalephae.
Related headwords
orderdefinitionextensivedefinitionhydrozoadefinitionacalephdefinitionwrittendefinitionzooidsdefinitionhydroidsdefinitionacalephaedefinitionattacheddefinitionbrancheddefinitioncolonydefinitionconsistingdefinitionelegantlydefinitionformsdefinitionfree-swimmingdefinitiongonosomedefinitiongonothecadefinitiongreatdefinitiongrowdefinitiongymnoblasteadefinitionhollowdefinitionhydrasdefinitionhydromedusadefinitionincludeddefinitionincludesdefinitionlargedefinitionmarinedefinitionnotedefinition
Definitions
- n. pl. An extensive order of Hydrozoa or Acalephae.
- An extensive order of Hydrozoa or Acalephæ. [Written also Hydroida.] Note: This order includes the hydras and the free-swimming hydromedusæ, 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.
- An extensive order of Hydrozoa or Acalephæ. [Written alsoHydroida.]