Words in english starting with O

• orange soda — Noun – English ～ orange-flavored carbonated drink
• order Solenichthyes — Noun – English ～ bellows fishes; shrimpfishes; cornetfishes; pipefishes; small order of chiefly tropical marine fishes of varied and bizarre form all having a small mouth at the end of a drawn-out tubular snout
• order Solenogastres — Noun – English ～ an order of Amphineura
• oil-soluble — Adjective – English ～ soluble in oil; "oil-soluble pigments"
• oriental sore — Noun – English ～ leishmaniasis of the skin; characterized by ulcerative skin lesions
• of sound mind — Adjective – English ～ of sound mind, memory, and understanding; in law, competent to go to trial
• oxtail soup — Noun – English ～ a soup made from the skinned tail of an ox
• open-source — Adjective – English ～ of or relating to or being computer software for which the source code is freely available
• Old South — Noun – English ～ the South of the United States before the American Civil War
• outer space — Noun – English ～ any location outside the Earth's atmosphere; "the astronauts walked in outer space without a tether"; "the first major milestone in space exploration was in 1957, when the USSR's Sputnik 1 orbited the Earth"
• order Spatangoida — Noun – English ～ heart-shaped sea urchins
• Oscan-speaking — Adjective – English ～ able to communicate in Oscan
• Orchis spectabilis — Noun – English ～ North American orchid having a spike of violet-purple flowers mixed with white; sepals and petals form a hood
• organ of speech — Noun – English ～ any of the organs involved in speech production
• off-speed pitch — Noun – English ～ a baseball thrown with little velocity when the batter is expecting a fastball
• Oswald Spengler — Noun – English ～ German philosopher who argued that cultures grow and decay in cycles (1880-1936)
• Orbignya spesiosa — Noun – English ～ tall feather palm of northern Brazil with hard-shelled nuts yielding valuable oil and a kind of vegetable ivory
• order Sphaeriales — Noun – English ～ large order of ascomycetous fungi usually having a dark hard perithecia with definite ostioles; in more recent classifications often divided among several orders
• order Sphaerocarpales — Noun – English ～ small order sometimes included in the order Jungermanniales
• order Sphagnales — Noun – English ～ coextensive with the genus Sphagnum; in some classifications isolated in a separate subclass

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