Nouns in english starting with O

• orthophosphoric acid — Noun – English ～ an acid used in fertilizers and soaps: H3PO4
• orthophosphorous acid — Noun – English ～ a clear or yellow monobasic acid (H3PO2)
• orthopnea — Noun – English ～ form of dyspnea in which the person can breathe comfortably only when standing or sitting erect; associated with asthma and emphysema and angina pectoris
• Orthopristis chrysopterus — Noun – English ～ found from Long Island southward
• Orthopristis — Noun – English ～ a genus of Haemulidae
• orthopter — Noun – English ～ heavier-than-air craft that is propelled by the flapping of wings
• Orthoptera — Noun – English ～ grasshoppers and locusts; crickets
• order Orthoptera — Noun – English ～ grasshoppers and locusts; crickets
• orthopteran — Noun – English ～ any of various insects having leathery forewings and membranous hind wings and chewing mouthparts
• orthopteron — Noun – English ～ any of various insects having leathery forewings and membranous hind wings and chewing mouthparts
• orthopterous insect — Noun – English ～ any of various insects having leathery forewings and membranous hind wings and chewing mouthparts
• orthoptics — Noun – English ～ treatment of defects of binocular vision (such as strabismus and amblyopia) by nonsurgical measures (especially by exercises to strengthen the eye muscles)
• 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
• orthotomus — Noun – English ～ tailorbirds
• 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)

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