hydroid

/ˈhaɪdrɔɪd/
IPA guide

Other forms: hydroids

Definitions of hydroid
  1. noun
    colonial coelenterates having the polyp phase dominant
    synonyms: hydrozoan
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    types:
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    planula
    the flat ciliated free-swimming larva of hydrozoan coelenterates
    hydra
    small tubular solitary freshwater hydrozoan polyp
    siphonophore
    a floating or swimming oceanic colony of polyps often transparent or showily colored
    sertularian
    feathery colony of long-branched stems bearing stalkless paired polyps
    nanomia
    small creatures resembling pieces of fuzzy rope; each with a cluster of swimming bells serving as the head and long elastic tentacles for drawing in prey
    Portuguese man-of-war, jellyfish, man-of-war
    large siphonophore having a bladderlike float and stinging tentacles
    praya
    colonial siphonophore of up to 130 ft long
    apolemia
    large siphonophore of up to 50 ft long
    type of:
    cnidarian, coelenterate
    radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms
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