Ornithogalum umbellatum
— Navneord
– Engelsk
~ common Old World herb having grasslike leaves and clusters of star-shaped white flowers with green stripes; naturalized in the eastern United States
Osco-Umbrian
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~ a group of dead languages of ancient Italy; they were displace by Latin
odd-toed ungulate
— Navneord
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~ placental mammals having hooves with an odd number of toes on each foot
olive-drab uniform
— Navneord
– Engelsk
~ military uniform of the United States Army; made from cloth of a dull olive color
Open University
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~ a British university that is open to people without formal academic qualifications and where teaching is by correspondence or broadcasting or summer school
order Urticales
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~ an order of dicotyledonous plants including Moraceae and Urticaceae and Ulmaceae
order Ustilaginales
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~ parasitic fungi causing smuts; sometimes placed in class Tiliomycetes
oral poliovirus vaccine
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~ an oral vaccine (containing live but weakened poliovirus) that is given to provide immunity to poliomyelitis
Oswald Veblen
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~ United States mathematician (1880-1960)
ophthalmic vein
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~ either of two veins that serve the eye; empties into the cavernous sinus
ovarian vein
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– Engelsk
~ 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
— Navneord
– Engelsk
~ a tributary of the coronary sinus; on the posterior wall of the left atrium
occipital vein
— Navneord
– Engelsk
~ a vein that drains the occipital region