Words starting with O that are validated

• order Sapindales — Noun – English ～ an order of dicotyledonous plants
• order Saprolegniales — Noun – English ～ order of chiefly aquatic fungi
• osteogenic sarcoma — Noun – English ～ malignant bone tumor; most common in children and young adults where it tends to affect the femur
• order Sarcosporidia — Noun – English ～ imperfectly known parasites of the muscles of vertebrates
• order Sarraceniales — Noun – English ～ plants that are variously modified to serve as insect traps: families Sarraceniaceae; Nepenthaceae; Droseraceae
• Oryza sativa — Noun – English ～ yields the staple food of 50 percent of world's population
• order Saurischia — Noun – English ～ extinct terrestrial reptiles: theropods (carnivorous); sauropods (herbivorous)
• order Sauropterygia — Noun – English ～ extinct marine reptiles: plesiosaurs; nothosaurs
• Old Saxon — Noun – English ～ Low German prior to 1200
• order Scandentia — Noun – English ～ a small order comprising only the tree shrews: in some classifications tree shrews are considered either primates (and included in the suborder Prosimii) or true insectivores (and included in the order Insectivora)
• os scaphoideum — Noun – English ～ the largest wrist bone on the thumb side
• old school — Noun – English ～ a class of people favoring traditional ideas
• out-of-school — Adjective – English ～ not attending school and therefore free to work; "opportunities for out-of-school youth"
• order Sclerodermatales — Noun – English ～ an order of fungi having a peridium surrounding a gleba (sometimes placed in subclass Homobasidiomycetes)
• order Scleroparei — Noun – English ～ scorpionfishes; sculpins; gurnards; greenlings; flying gurnards
• Oriental scops owl — Noun – English ～ Asian scops owl
• Otus scops — Noun – English ～ European scops owl
• order Scorpionida — Noun – English ～ true scorpions
• order Scrophulariales — Noun – English ～ used in some classification systems; often included in the order Polemoniales
• Oxyuranus scutellatus — Noun – English ～ large highly venomous snake of northeastern Australia

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