Nouns in english starting with O

• Oncovin — Noun – English ～ periwinkle plant derivative used as an antineoplastic drug (trade name Oncovin); used to treat cancer of the lymphatic system
• ondaatje — Noun – English ～ Canadian writer (born in Sri Lanka in 1943)
• Ondatra — Noun – English ～ muskrats
• one-and-one — Noun – English ～ a foul shot that must be made in order to earn the right to a second foul shot
• one-hundredth — Noun – English ～ one part in a hundred equal parts
• one million million — Noun – English ～ the number that is represented as a one followed by 12 zeros; "in England they call a trillion a billion"
• one-half — Noun – English ～ one of two equal parts of a divisible whole; "half a loaf"; "half an hour"; "a century and one half"
• one — Noun – English ～ the smallest whole number or a numeral representing this number; "he has the one but will need a two and three to go with it"; "they had lunch at one"
• one-eighth — Noun – English ～ one part in eight equal parts
• one million million — Noun – English ～ the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen
• one-liner — Noun – English ～ a one-line joke
• one-hitter — Noun – English ～ a game in which a pitcher allows the opposing team only one hit
• one — Noun – English ～ a single person or thing; "he is the best one"; "this is the one I ordered"
• one-fifth — Noun – English ～ one part in five equal parts
• one-off — Noun – English ～ a happening that occurs only once and is not repeated
• one-millionth — Noun – English ～ one part in a million equal parts
• one million million million — Noun – English ～ the number that is represented as a one followed by 18 zeros; "in England they call a quintillion a trillion"
• one-hundred-millionth — Noun – English ～ one part in a hundred million equal parts
• one-armed bandit — Noun – English ～ a slot machine that is used for gambling; "they spend hours and hours just playing the slots"
• one-dimensional language — Noun – English ～ a programming language whose expressions are represented by strings of characters

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