Nouns in english starting with O

• ophthalmologist — Noun – English ～ a medical doctor specializing in the diagnosis and treatment of diseases of the eye
• ophthalmology — Noun – English ～ the branch of medicine concerned with the eye and its diseases
• ophthalmoplegia — Noun – English ～ paralysis of the motor nerves of the eye
• ophthalmoscope — Noun – English ～ medical instrument for examining the retina of the eye
• ophthalmoscopy — Noun – English ～ examination of the interior of an eye using an ophthalmoscope
• opiate — Noun – English ～ a narcotic drug that contains opium or an opium derivative
• Opiliones — Noun – English ～ harvestmen
• opinion — Noun – English ～ the reason for a court's judgment (as opposed to the decision itself)
• opinion — Noun – English ～ a belief or sentiment shared by most people; the voice of the people; "he asked for a poll of public opinion"
• opinion — Noun – English ～ the legal document stating the reasons for a judicial decision; "opinions are usually written by a single judge"
• opinion — Noun – English ～ a message expressing a belief about something; the expression of a belief that is held with confidence but not substantiated by positive knowledge or proof; "his opinions appeared frequently on the editorial page"
• opinion — Noun – English ～ a personal belief or judgment that is not founded on proof or certainty; "my opinion differs from yours"; "I am not of your persuasion"; "what are your thoughts on Haiti?"
• opinion — Noun – English ～ a vague idea in which some confidence is placed; "his impression of her was favorable"; "what are your feelings about the crisis?"; "it strengthened my belief in his sincerity"; "I had a feeling that she was lying"
• Opisthobranchia — Noun – English ～ gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares
• Opisthocomidae — Noun – English ～ comprising the hoatzins
• Opisthocomus — Noun – English ～ type genus of the Opisthocomidae: hoatzins
• Opisthocomus hoazin — Noun – English ～ crested ill-smelling South American bird whose young have claws on the first and second digits of the wings
• Opisthognathidae — Noun – English ～ jawfishes
• opisthorchiasis — Noun – English ～ infestation with flukes obtained from eating raw fish; common in eastern Asia
• opisthotonos — Noun – English ～ severe spasm in which the back arches and the head bends back and heels flex toward the back

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