Nouns starting with O that are validated

• Old World scops owl — Noun – English ～ European scops owl
• Old World quail — Noun – English ～ small game bird with a rounded body and small tail
• Old world white pelican — Noun – English ～ similar to American white pelican
• Old World rabbit — Noun – English ～ common greyish-brown burrowing animal native to southern Europe and northern Africa but introduced elsewhere; widely domesticated and developed in various colors and for various needs; young are born naked and helpless
• oligochaete worm — Noun – English ～ hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body
• open-end wrench — Noun – English ～ a wrench having parallel jaws at fixed separation (often on both ends of the handle)
• Orville Wright — Noun – English ～ United States aviation pioneer who (with his brother Wilbur Wright) invented the airplane (1871-1948)
• order Xiphosura — Noun – English ～ horseshoe crabs and extinct forms
• order Xyridales — Noun – English ～ an order of monocotyledonous herbs
• Ortega y Gasset — Noun – English ～ Spanish philosopher who advocated leadership by an intellectual elite (1883-1955)
• off year — Noun – English ～ a year in which no major political elections are held
• off year — Noun – English ～ a year in which productivity is low or inferior
• onion yellow-dwarf virus — Noun – English ～ the virus that produces stunting and yellowing of the leaves of onion plants
• onion yellow dwarf — Noun – English ～ the yellow dwarf disease of onion plants
• orange yellow — Noun – English ～ a shade of yellow tinged with orange
• Old World yew — Noun – English ～ predominant yew in Europe; extraordinarily long-lived and slow growing; one of the oldest species in the world
• order Zeomorphi — Noun – English ～ dories
• orange zest — Noun – English ～ tiny bits of orange peel
• Olympian Zeus — Noun – English ～ a seated statue of the supreme god of ancient Greek mythology created for the temple at Olympia; the statue was 40 feet tall and rested on a base that was 12 feet high
• Ondatra zibethica — Noun – English ～ beaver-like aquatic rodent of North America with dark glossy brown fur

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