Nouns starting with O

• ostomy — Noun – English ～ surgical procedure that creates an artificial opening for the elimination of bodily wastes
• Ostraciidae — Noun – English ～ boxfishes
• ostracism — Noun – English ～ the state of being banished or ostracized (excluded from society by general consent); "the association should get rid of its elderly members--not by euthanasia, of course, but by Coventry"
• ostracism — Noun – English ～ the act of excluding someone from society by general consent
• ostracod — Noun – English ～ tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shell
• Ostracoda — Noun – English ～ seed shrimps
• ostracoderm — Noun – English ～ extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic
• order Ostracodermi — Noun – English ～ extinct group of armored jawless vertebrates; taxonomy is not clear
• Ostracodermi — Noun – English ～ extinct group of armored jawless vertebrates; taxonomy is not clear
• ostrava — Noun – English ～ an industrial city in northwestern Czech Republic in the Moravian lowlands; located in the coal mining area of Silesia
• Ostrea gigas — Noun – English ～ a large oyster native to Japan and introduced along the Pacific coast of the United States; a candidate for introduction in Chesapeake Bay
• ostrea — Noun – English ～ type genus of the family Ostreidae
• Ostreidae — Noun – English ～ oysters
• ostrich — Noun – English ～ fast-running African flightless bird with two-toed feet; largest living bird
• ostrich fern — Noun – English ～ tall fern of northern temperate regions having graceful arched fronds and sporophylls resembling ostrich plumes
• ostrich — Noun – English ～ a person who refuses to face reality or recognize the truth (a reference to the popular notion that the ostrich hides from danger by burying its head in the sand)
• Ostrogoth — Noun – English ～ a member of the eastern group of Goths who created a kingdom in northern Italy around 500 AD
• Ostrya carpinifolia — Noun – English ～ medium-sized hop hornbeam of southern Europe and Asia Minor
• Ostrya — Noun – English ～ deciduous monoecious trees of Europe and Asia and America; sometimes placed in subfamily or family Carpinaceae
• Ostryopsis — Noun – English ～ deciduous monoecious shrubs of China and Mongolia resembling trees of the genus Ostrya; sometimes placed in subfamily or family Carpinaceae

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