Noun ornithischia has 1 sense
  1. Ornithischia, order Ornithischia - extinct terrestrial reptiles having birdlike pelvises: armored dinosaurs (thyreophorans); bone-headed and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods)
    --1 is a kind of animal order
    --1 is a member of Archosauria, subclass Archosauria
    --1 has members:
     ornithischian, ornithischian dinosaur; genus Pisanosaurus; genus Staurikosaurus; Thyreophora, suborder Thyreophora, thyreophoran; Marginocephalia, suborder Marginocephalia, marginocephalian; Euronithopoda, suborder Euronithopoda, euronithopod, Ornithopoda, suborder Ornithopoda
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