Words starting with O that are validated

• oyster plant — Noun – English ～ long white salsify
• oyster plant — Noun – English ～ Mediterranean biennial herb with long-stemmed heads of purple ray flowers and milky sap and long edible root; naturalized throughout United States
• oyster plant — Noun – English ～ edible root of the salsify plant
• order Plantaginales — Noun – English ～ coextensive with the family Plantaginaceae
• Ozark Plateau — Noun – English ～ an area of low mountains in northwestern Arkansas and southeastern Missouri and northeastern Oklahoma
• order Platyctenea — Noun – English ～ an order of Tentaculata
• out of play — Adjective – English ～ (of a ball) not available to be played during a game; "a ball that is out of play is dead"
• order Plecoptera — Noun – English ～ stoneflies
• order Plectognathi — Noun – English ～ boxfishes; filefishes; globefishes; ocean sunfishes; triggerfishes; puffers
• order Pleuronectiformes — Noun – English ～ flatfishes: halibut; sole; flounder; plaice; turbot; tonguefishes
• order Plumbaginales — Noun – English ～ coextensive with the family Plumbaginaceae; usually included in order Primulales
• out-of-pocket — Adjective – English ～ calling for the spending of cash; "his out-of-pocket costs were $10"
• order Podicipediformes — Noun – English ～ grebes
• order Podicipitiformes — Noun – English ～ grebes
• olla podrida — Noun – English ～ Spanish version of burgoo
• orbital point — Noun – English ～ the craniometric point at the lowest point on the lower edge of the orbit
• order Polemoniales — Noun – English ～ Polemoniaceae; Solanaceae; Boraginaceae; Labiatae; Lentibulariaceae; Pedaliaceae; in some classifications includes the order Scrophulariales
• Ovis poli — Noun – English ～ Asiatic wild sheep with exceptionally large horns; sometimes considered a variety of the argali (or Ovis ammon)
• open-door policy — Noun – English ～ the policy of granting equal trade opportunities to all countries
• opinion poll — Noun – English ～ an inquiry into public opinion conducted by interviewing a random sample of people

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