Ornithischia
or·nit·hisc·hia
noun
1.
extinct terrestrial reptiles having birdlike pelvises: armored dinosaurs (thyreophorans); bone-headed and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods)
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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.