Definitions of cnidarian
  1. noun
    radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms
    synonyms: coelenterate
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    one of two forms that coelenterates take (e.g. a hydra or coral): usually sedentary with a hollow cylindrical body usually with a ring of tentacles around the mouth
    medusa, medusan, medusoid
    one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles
    any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans
    any of various usually free-swimming marine coelenterates having a gelatinous medusoid stage as the dominant phase of its life cycle
    hydroid, hydrozoan
    colonial coelenterates having the polyp phase dominant
    actinozoan, anthozoan
    sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed
    the flat ciliated free-swimming larva of hydrozoan coelenterates
    small medusa
    Chrysaora quinquecirrha
    a type of jellyfish
    small tubular solitary freshwater hydrozoan polyp
    a floating or swimming oceanic colony of polyps often transparent or showily colored
    feathery colony of long-branched stems bearing stalkless paired polyps
    anemone, sea anemone
    marine polyps that resemble flowers but have oral rings of tentacles; differ from corals in forming no hard skeleton
    sea pen
    fleshy featherlike warm-water colonies
    marine colonial polyp characterized by a calcareous skeleton; masses in a variety of shapes often forming reefs
    type of:
    any animal lacking a backbone or notochord; the term is not used as a scientific classification
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