ˌȯ(r)nəˈthiskēə noun plural
Usage: capitalized
Etymology: New Latin, from ornith- + -ischia (from Greek ischion hip joint) — more at ischium
: an order of archosaurian reptiles comprising herbivorous dinosaurs with tetraradiate pelves and including many bizarre forms (as the armored dinosaurs of the suborders Stegosauria and Ankylosauria and the horned dinosaurs of the suborder Ceratopsia)
• or·nith·is·chi·an | ̷ ̷ ̷ ̷| ̷ ̷skēən adjective or noun