Nouns in english starting with O

• Ononis — Noun – English ～ genus of European subshrubs or herbs having pink or purple or yellow solitary or clustered flowers: restharrow
• Onopordon acanthium — Noun – English ～ biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America
• Onopordon — Noun – English ～ a genus of Eurasian herbs of the family Compositae with prickly foliage and large purplish flowers
• Onopordum acanthium — Noun – English ～ biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America
• Onopordum — Noun – English ～ a genus of Eurasian herbs of the family Compositae with prickly foliage and large purplish flowers
• Onosmodium — Noun – English ～ a genus of North American perennial herbs of the family Boraginaceae
• onrush — Noun – English ～ a forceful forward rush or flow; "from the bow she stared at the mesmerising onrush of the sea where it split and foamed"; "the explosion interrupted the wild onrush of her thoughts"
• onrush — Noun – English ～ (military) an offensive against an enemy (using weapons); "the attack began at dawn"
• Onsager — Noun – English ～ United States chemist (born in Norway) noted for his work in thermodynamics (1903-1976)
• onset — Noun – English ～ the beginning or early stages; "the onset of pneumonia"
• onset — Noun – English ～ (military) an offensive against an enemy (using weapons); "the attack began at dawn"
• onslaught — Noun – English ～ the rapid and continuous delivery of linguistic communication (spoken or written); "a barrage of questions"; "a bombardment of mail complaining about his mistake"
• onslaught — Noun – English ～ a sudden and severe onset of trouble
• onslaught — Noun – English ～ (military) an offensive against an enemy (using weapons); "the attack began at dawn"
• Ontario — Noun – English ～ a prosperous and industrialized province in central Canada
• ontario — Noun – English ～ the smallest of the Great Lakes
• ontogenesis — Noun – English ～ (biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level; "he proposed an indicator of osseous development in children"
• ontogeny — Noun – English ～ (biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level; "he proposed an indicator of osseous development in children"
• ontology — Noun – English ～ the metaphysical study of the nature of being and existence
• ontology — Noun – English ～ (computer science) a rigorous and exhaustive organization of some knowledge domain that is usually hierarchical and contains all the relevant entities and their relations

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