Nouns starting with O

• Oswald Spengler — Noun – English ～ German philosopher who argued that cultures grow and decay in cycles (1880-1936)
• Orbignya spesiosa — Noun – English ～ tall feather palm of northern Brazil with hard-shelled nuts yielding valuable oil and a kind of vegetable ivory
• order Sphaeriales — Noun – English ～ large order of ascomycetous fungi usually having a dark hard perithecia with definite ostioles; in more recent classifications often divided among several orders
• order Sphaerocarpales — Noun – English ～ small order sometimes included in the order Jungermanniales
• order Sphagnales — Noun – English ～ coextensive with the genus Sphagnum; in some classifications isolated in a separate subclass
• Ophrys sphegodes — Noun – English ～ spring-blooming spider orchid having a flower with yellow or green or pink sepals and a broad brown velvety lip
• order Sphenisciformes — Noun – English ～ penguins
• os sphenoidale — Noun – English ～ butterfly-shaped bone at the base of the skull
• Ononis spinosa — Noun – English ～ Eurasian plant having loose racemes of pink or purple flowers and spiny stems and tough roots
• order Spirochaetales — Noun – English ～ higher bacteria; slender spiral rodlike forms
• outdoor sport — Noun – English ～ a sport that is played outdoors
• one-spot — Noun – English ～ a domino or die whose upward face shows one pip
• oriental spruce — Noun – English ～ evergreen tree of the Caucasus and Asia Minor used as an ornamental having pendulous branchlets
• order Squamata — Noun – English ～ diapsid reptiles: snakes and lizards
• old squaw — Noun – English ～ a common long-tailed sea duck of the northern parts of the United States
• office staff — Noun – English ～ professional or clerical workers in an office; "the whole office was late the morning of the blizzard"
• oral stage — Noun – English ～ (psychoanalysis) the first sexual and social stage of an infant's development; the mouth is the focus of the libido and satisfaction comes from suckling and chewing and biting
• outdoor stage — Noun – English ～ a platform where a (brass) band can play in the open air
• old stager — Noun – English ～ an experienced person who has been through many battles; someone who has given long service
• oil stain — Noun – English ～ a stain produced by oil

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