Words in english starting with O that are validated

• Oenanthe aquatica — Noun – English ～ European poisonous herb with fibrous roots
• Oengus — Noun – English ～ Celtic god of love and beauty; patron deity of young men and women
• oenologist — Noun – English ～ a specialist in wine making
• oenology — Noun – English ～ the art of wine making
• oenomel — Noun – English ～ wine mixed with honey
• oenophile — Noun – English ～ someone who appreciates wine
• Oenothera biennis — Noun – English ～ a coarse biennial of eastern North America with yellow flowers that open in the evening; naturalized in Europe
• Oenothera — Noun – English ～ chiefly North American herbs with usually nocturnal flowers
• Oenothera macrocarpa — Noun – English ～ evening-opening primrose of south central United States
• Oenothera fruticosa — Noun – English ～ a day-flowering biennial or perennial of the genus Oenothera
• oersted — Noun – English ～ the magnetic field strength 1 cm from a unit magnetic pole
• Oersted — Noun – English ～ Danish physicist (1777-1851)
• oesophagitis — Noun – English ～ inflammation of the esophagus; often caused by gastroesophageal reflux
• oesophagogastric junction — Noun – English ～ the junction between the esophagus and the stomach epithelium
• oesophagoscope — Noun – English ～ an optical instrument for examining the inside of the esophagus
• oesophagus — Noun – English ～ the passage between the pharynx and the stomach
• oesterreich — Noun – English ～ a mountainous republic in central Europe; under the Habsburgs (1278-1918) Austria maintained control of the Holy Roman Empire and was a leader in European politics until the 19th century
• oestradiol — Noun – English ～ the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer
• Oestridae — Noun – English ～ warble flies
• oestriol — Noun – English ～ a naturally occurring estrogenic hormone; a synthetic form is used to treat estrogen deficiency

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