Words in english starting with O

• orthoptist — Noun – English ～ a specialist in orthoptics
• orthoscope — Noun – English ～ an ophthalmoscope with a layer of water to neutralize the refraction of the cornea
• orthostatic hypotension — Noun – English ～ low blood pressure occurring in some people when they stand up
• orthostatic — Adjective – English ～ pertaining to an upright standing posture; "orthostatic hypotension"
• orthotomus — Noun – English ～ tailorbirds
• orthotropous — Adjective – English ～ (of a plant ovule) completely straight with the micropyle at the apex
• ortolan bunting — Noun – English ～ brownish Old World bunting often eaten as a delicacy
• ortolan — Noun – English ～ brownish Old World bunting often eaten as a delicacy
• ortygan — Noun – English ～ any of several East Indian birds
• Orudis — Noun – English ～ nonsteroidal anti-inflammatory drug (trade names Orudis or Orudis KT or Oruvail)
• Orudis KT — Noun – English ～ nonsteroidal anti-inflammatory drug (trade names Orudis or Orudis KT or Oruvail)
• Orumiyeh — Noun – English ～ a city on the western side of Lake Urmia in northwestern Iran
• Oruvail — Noun – English ～ nonsteroidal anti-inflammatory drug (trade names Orudis or Orudis KT or Oruvail)
• orwell — Noun – English ～ imaginative British writer concerned with social justice (1903-1950)
• orwellian — Adjective – English ～ of or relating to the works of George Orwell (especially his picture of a future totalitarian state)
• Orycteropodidae — Noun – English ～ aardvarks
• Orycteropus — Noun – English ～ coextensive with the family Orycteropodidae
• Orycteropus afer — Noun – English ～ nocturnal burrowing mammal of the grasslands of Africa that feeds on termites; sole extant representative of the order Tubulidentata
• Oryctolagus — Noun – English ～ Old World rabbits
• Oryctolagus cuniculus — Noun – English ～ common greyish-brown burrowing animal native to southern Europe and northern Africa but introduced elsewhere; widely domesticated and developed in various colors and for various needs; young are born naked and helpless

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