Nouns starting with O

• orb-weaver — Noun – English ～ spiders that spin orb webs; cosmopolitan in distribution
• orb-weaving spider — Noun – English ～ a spider that spins a circular (or near circular) web
• orb web — Noun – English ～ a circular spider web
• oil well — Noun – English ～ a well that yields or has yielded oil
• Orson Welles — Noun – English ～ United States actor and filmmaker (1915-1985)
• Oliver Wendell Holmes — Noun – English ～ United States writer of humorous essays (1809-1894)
• Oliver Wendell Holmes Jr. — Noun – English ～ United States jurist noted for his liberal opinions (1841-1935)
• Oregon white oak — Noun – English ～ small deciduous tree of western North America with crooked branches and pale grey bark
• off-white — Noun – English ～ a shade of white the color of bleached bones
• oceanic whitetip shark — Noun – English ～ large deep-water shark with white-tipped dorsal fin; worldwide distribution; most dangerous shark
• Oscar Wilde — Noun – English ～ Irish writer and wit (1854-1900)
• Oscar Fingal O'Flahertie Wills Wilde — Noun – English ～ Irish writer and wit (1854-1900)
• oriel window — Noun – English ～ a projecting bay window corbeled or cantilevered out from a wall
• oval window — Noun – English ～ fenestra that has the base of the stapes attached to it
• one-flowered wintergreen — Noun – English ～ delicate evergreen dwarf herb of north temperate regions having a solitary white terminal flower; sometimes placed in genus Pyrola
• oil of wintergreen — Noun – English ～ oil or flavoring obtained from the creeping wintergreen or teaberry plant
• Owen Wister — Noun – English ～ United States writer (1860-1938)
• old witch grass — Noun – English ～ North American grass with slender brushy panicles; often a weed on cultivated land
• old witchgrass — Noun – English ～ North American grass with slender brushy panicles; often a weed on cultivated land
• old wives' tale — Noun – English ～ a bit of lore passed on by word of mouth

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