Words in english starting with O

• one-upmanship — Noun – English ～ the practice of keeping one jump ahead of a friend or competitor
• obtrude upon — Verb – English ～ to intrude upon, infringe, encroach on, violate; "This new colleague invades my territory"; "The neighbors intrude on your privacy"
• order Uredinales — Noun – English ～ rust fungi: parasitic fungi causing rust in plants; sometimes placed in
• order Urodella — Noun – English ～ salamanders; newts; congo snakes
• order Uropygi — Noun – English ～ whip scorpions
• order Urticales — Noun – English ～ an order of dicotyledonous plants including Moraceae and Urticaceae and Ulmaceae
• order Ustilaginales — Noun – English ～ parasitic fungi causing smuts; sometimes placed in class Tiliomycetes
• oral poliovirus vaccine — Noun – English ～ an oral vaccine (containing live but weakened poliovirus) that is given to provide immunity to poliomyelitis
• Oswald Veblen — Noun – English ～ United States mathematician (1880-1960)
• ophthalmic vein — Noun – English ～ either of two veins that serve the eye; empties into the cavernous sinus
• ovarian vein — Noun – English ～ one of the veins that drain the ovaries; the right opens into the inferior vena cava; the left opens into the left renal vein
• oblique vein of the left atrium — Noun – English ～ a tributary of the coronary sinus; on the posterior wall of the left atrium
• occipital vein — Noun – English ～ a vein that drains the occipital region
• obturator vein — Noun – English ～ a vein formed by the union of tributaries that drain the hip joints and thigh muscles; empties into the internal iliac vein
• oesophageal veins — Noun – English ～ small veins from the esophagus emptying into the brachiocephalic vein or the azygos veins
• object of the verb — Noun – English ～ the object that receives the direct action of the verb
• Opheodrys vernalis — Noun – English ～ of western and central United States
• Ortilis vetula macalli — Noun – English ～ of Mexico and Texas
• Onobrychis viciaefolia — Noun – English ～ Eurasian perennial herb having pale pink flowers and curved pods; naturalized in Britain and North America grasslands on calcareous soils; important forage crop and source of honey in Britain
• Onobrychis viciifolia — Noun – English ～ Eurasian perennial herb having pale pink flowers and curved pods; naturalized in Britain and North America grasslands on calcareous soils; important forage crop and source of honey in Britain

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