Nouns in english starting with O

• ornithischia — Noun – English ～ extinct terrestrial reptiles having bird-like pelvises: armored dinosaurs (thyreophorans); boneheaded and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods)
• order Ornithischia — Noun – English ～ extinct terrestrial reptiles having bird-like pelvises: armored dinosaurs (thyreophorans); boneheaded and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods)
• ornithischian — Noun – English ～ herbivorous dinosaur with a pelvis like that of a bird
• ornithischian dinosaur — Noun – English ～ herbivorous dinosaur with a pelvis like that of a bird
• Ornithogalum — Noun – English ～ sometimes placed in family Hyacinthaceae
• ornithologist — Noun – English ～ a zoologist who studies birds
• ornithology — Noun – English ～ the branch of zoology that studies birds
• ornithomimid — Noun – English ～ lightly built medium-sized dinosaur having extremely long limbs and necks with small heads and big brains and large eyes
• Ornithomimida — Noun – English ～ lightly built medium-size theropods
• ornithopod dinosaur — Noun – English ～ bipedal herbivorous dinosaur
• ornithopod — Noun – English ～ bipedal herbivorous dinosaur
• ornithopoda — Noun – English ～ widespread group including duck-billed dinosaurs and their early relatives (hadrosaurs, trachodon and iguanodon)
• ornithopter — Noun – English ～ heavier-than-air craft that is propelled by the flapping of wings
• Ornithorhynchidae — Noun – English ～ platypus
• Ornithorhynchus — Noun – English ～ type genus of the family Ornithorhynchidae
• Ornithorhynchus anatinus — Noun – English ～ small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae
• ornithosis — Noun – English ～ an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds
• Orobanchaceae — Noun – English ～ brown or yellow leafless herbs; sometimes placed in the order Scrophulariales
• orogeny — Noun – English ～ the process of mountain formation (especially by the upward displacement of the earth's crust)
• orography — Noun – English ～ the science of mountains

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