Nouns starting with O

• on the road — Noun – English ～ travelling about; "they took the show on the road"; "they lost all their games on the road"
• Organization of the Oppressed on Earth — Noun – English ～ a Shiite terrorist organization with strong ties to Iran; seeks to create an Iranian fundamentalist Islamic state in Lebanon; car bombs are the signature weapon
• Order of the Purple Heart — Noun – English ～ a United States military decoration awarded to any member of the armed forces who is wounded in action
• order of the day — Noun – English ～ the order of business for an assembly on a given day
• over-the-counter drug — Noun – English ～ a drug that is sold without a prescription
• over-the-shoulder bombing — Noun – English ～ a special case of loft bombing in which the bomb is released past the vertical so it is tossed back to the target
• over-the-counter market — Noun – English ～ a stock exchange where securities transactions are made via telephone and computer rather than on the floor of an exchange
• Otto the Great — Noun – English ～ King of the Germans and Holy Roman Emperor (912-973)
• over the counter stock — Noun – English ～ stock that is not listed and traded on an organized exchange
• over-the-counter medicine — Noun – English ～ a drug that is sold without a prescription
• over the counter security — Noun – English ～ a security traded in the over-the-counter market
• old man of the mountain — Noun – English ～ whitish hairy plant with featherlike leaves and a few stout stems each bearing an especially handsome solitary large yellow flower head; mountainous regions north central United States
• Office of the Dead — Noun – English ～ an office read or sung before a burial mass in the Roman Catholic Church
• operating theater — Noun – English ～ a room in a hospital equipped for the performance of surgical operations; "great care is taken to keep the operating rooms aseptic"
• operating theatre — Noun – English ～ a room in a hospital equipped for the performance of surgical operations; "great care is taken to keep the operating rooms aseptic"
• order Thecodontia — Noun – English ～ extinct terrestrial reptiles having teeth set in sockets; of the late Permian to Triassic
• Ostwald's theory of indicators — Noun – English ～ (chemistry) the theory that all indicators are either weak acids or weak bases in which the color of the ionized form is different from the color before dissociation
• order Therapsida — Noun – English ～ extinct mammal-like reptiles found inhabiting all continents from the mid Permian to late Triassic
• occupational therapy — Noun – English ～ therapy based on engagement in meaningful activities of daily life, especially to enable or encourage participation in such activities in spite of impairments or limitations in physical or mental functions
• oven thermometer — Noun – English ～ a thermometer that registers the temperature inside an oven

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