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ornithischianOne entry found. Main Entry: or·nith·is·chi·an Pronunciation: \ˌȯr-nə-ˈthis-kē-ən\ Function: noun Etymology: New Latin Ornithischia, from ornith- + ischium Date: 1933 : any of an order (Ornithischia) of herbivorous dinosaurs (as a stegosaurus) that have the pubis of the pelvis rotated backward to a position parallel and close to the ischium — compare saurischian — ornithischian adjective
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