Words starting with O that are validated

• OTC stock — Noun – English ～ stock that is not listed and traded on an organized exchange
• out of stock — Adjective – English ～ not available for sale or use; "too many items are out of stock"
• order Stomatopoda — Noun – English ～ mantis shrimps
• Oliver Stone — Noun – English ～ United States filmmaker (born in 1946)
• organ stop — Noun – English ～ a graduated set of organ pipes of like tone quality
• ordnance store — Noun – English ～ military supplies
• Operation Desert Storm — Noun – English ～ the United States and its allies defeated Iraq in a ground war that lasted 100 hours (1991)
• off-street — Adjective – English ～ not on the streets; "off-street parking"; "off-street unloading of vehicles"
• on-street — Adjective – English ～ at the sides of streets; "on-street parking is prohibited at rush hour"
• order Strigiformes — Noun – English ～ owls
• organic structure — Noun – English ～ the entire physical structure of an organism (an animal, plant, or human being); "he felt as if his whole body were on fire"
• order Struthioniformes — Noun – English ～ a ratite bird order: ostriches and related extinct birds; known from the Pleistocene onward
• Onoclea struthiopteris — Noun – English ～ tall fern of northern temperate regions having graceful arched fronds and sporophylls resembling ostrich plumes
• Oriental Studies — Noun – English ～ the scholarly knowledge of Asian cultures and languages and people
• Oven Stuffer Roaster — Noun – English ～ a brand name for a roasting chicken
• Oven Stuffer — Noun – English ～ a brand name for a roasting chicken
• oyster stuffing — Noun – English ～ stuffing made with oysters
• old style — Noun – English ～ a typeface (based on an 18th century design) distinguished by irregularity and slanted ascender serifs and little contrast between light and heavy strokes
• old style font — Noun – English ～ a typeface (based on an 18th century design) distinguished by irregularity and slanted ascender serifs and little contrast between light and heavy strokes
• Old Style calendar — Noun – English ～ the solar calendar introduced in Rome in 46 b.c. by Julius Caesar and slightly modified by Augustus, establishing the 12-month year of 365 days with each 4th year having 366 days and the months having 31 or 30 days except for February

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