Words in english starting with O

• orbit period — Noun – English ～ the time it takes to complete one full orbit around a celestial body; "the orbit period depends on the altitude of the satellite"
• overtime period — Noun – English ～ a period of overtime play to resolve a tie; e.g. basketball
• order Perissodactyla — Noun – English ～ nonruminant ungulates: horses; tapirs; rhinoceros; extinct forms
• order Peronosporales — Noun – English ～ order of chiefly parasitic lower fungi: Albuginaceae and Peronosporaceae and Pythiaceae
• Oliver Hazard Perry — Noun – English ～ United States commodore who led the fleet that defeated the British on Lake Erie during the War of 1812; brother of Matthew Calbraith Perry (1785-1819)
• old person — Noun – English ～ an elderly person
• one-person — Adjective – English ～ designed for or restricted to a single person; "a one-man show"; "a one-person tent"; "Sarah Silverman's hilarious one-woman show"
• oral personality — Noun – English ～ (psychoanalysis) a personality characterized either by generous optimism or aggressive and ambitious selfishness; formed in early childhood by fixation during the oral stage of development
• obsessive-compulsive personality — Noun – English ～ personality characterized by a strong need to repeat certain acts or rituals
• Oxalis pes-caprae — Noun – English ～ South African bulbous wood sorrel with showy yellow flowers
• Organization of Petroleum-Exporting Countries — Noun – English ～ an organization of countries formed in 1961 to agree on a common policy for the production and sale of petroleum
• order Pezizales — Noun – English ～ order of mostly saprophytic fungi having cup-shaped ascocarps
• order Phalangida — Noun – English ～ harvestmen
• Orbignya phalerata — Noun – English ～ tall feather palm of northern Brazil with hard-shelled nuts yielding valuable oil and a kind of vegetable ivory
• order Phallales — Noun – English ～ order of fungi comprising the stinkhorns and related forms whose mature hymenium is slimy and fetid; sometimes placed in subclass Homobasidiomycetes
• oral phase — 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
• order Phasmatodea — Noun – English ～ in some classifications considered a suborder of Orthoptera: stick insects; leaf insects
• order Phasmida — Noun – English ～ in some classifications considered a suborder of Orthoptera: stick insects; leaf insects
• organic phenomenon — Noun – English ～ (biology) a natural phenomenon involving living plants and animals
• optical phenomenon — Noun – English ～ a physical phenomenon related to or involving light

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