Words in english starting with O

• olde worlde — Adjective – English ～ attractively old-fashioned (but not necessarily authentic); "houses with quaint thatched roofs"; "a vaulted roof supporting old-time chimney pots"
• 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
• one-year-old — Adjective – English ～ one year of age
• one-year — Adjective – English ～ completing its life cycle within a year; "a border of annual flowering plants"
• 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
• off your guard — Adjective – English ～ not prepared or vigilant; "the blow caught him napping"; "caught in an off-guard moment"; "found him off his guard"
• on your guard — Adjective – English ～ vigilant; "on guard against con artists"; "must remain on your guard in such a situation"
• 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

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