Words starting with O that are validated

• order Polygonales — Noun – English ～ coextensive with the family Polygonaceae,
• order Polymastigina — Noun – English ～ small usually parasitic flagellates
• order Polypodiales — Noun – English ～ true (leptosporangiate) ferns
• opium poppy — Noun – English ～ southwestern Asian herb with greyish leaves and white or reddish flowers; source of opium
• oriental poppy — Noun – English ～ commonly cultivated Asiatic perennial poppy having stiff heavily haired leaves and bright scarlet or pink to orange flowers
• observation post — Noun – English ～ an elevated post affording a wide view
• ocean pout — Noun – English ～ common along northeastern coast of North America
• out of practice — Adjective – English ～ impaired in skill by neglect
• ovarian pregnancy — Noun – English ～ ectopic pregnancy in the ovary
• object of a preposition — Noun – English ～ the object governed by a preposition
• oral presentation — Noun – English ～ delivering an address to a public audience; "people came to see the candidates and hear the speechmaking"
• osmotic pressure — Noun – English ～ (physical chemistry) the pressure exerted by a solution necessary to prevent osmosis into that solution when it is separated from the pure solvent by a semipermeable membrane
• oil pressure — Noun – English ～ pressure that keeps oil on the moving parts of an internal-combustion engine
• offer price — Noun – English ～ (stock market) the price at which a broker is willing to sell a certain security
• open primary — Noun – English ～ a primary in which any registered voter can vote (but must vote for candidates of only one party)
• order Primates — Noun – English ～ an animal order including lemurs and tarsiers and monkeys and apes and human beings
• order Primulales — Noun – English ～ Primulaceae; Theophrastaceae; Myrsinaceae; and (in some classifications) Plumbaginaceae
• Ochotona princeps — Noun – English ～ North American pika
• out of print — Adjective – English ～ (of books) no longer offered for sale by a publisher; "that edition is out of print"
• offset printing — Noun – English ～ a plate makes an inked impression on a rubber-blanketed cylinder, which in turn transfers it to the paper

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