physophorae definition

  • noun-plural:
    • An order of Siphonophora, furnished with an air sac, or float, and some nectocalyces. See Illust. under nectocalyx.
  • noun:
    • An order of siphonophorous oceanic hydrozoans, obtaining the proximal end changed into a float or pneumatophore (as distinguished from a somatocyst).

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