Nouns starting with O

• ozone layer — Noun – English ～ a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun
• ozonide — Noun – English ～ any of a class of unstable chemical compounds resulting from the addition of ozone to a double bond in an unsaturated compound
• Ozonium — Noun – English ～ form genus of imperfect fungi
• ozonlag — Noun – Danish ～ atmosfærens lag af ozon, der virker som et skjold ...
• ozonosphere — Noun – English ～ a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun
• Ozothamnus — Noun – English ～ genus of Australian shrubs and perennial herbs; sometimes included in genus Helichrysum
• oil paint — Noun – English ～ paint in which a drying oil is the vehicle
• oil painter — Noun – English ～ a painter who uses oil paints
• oil painting — Noun – English ～ a picture painted with oil paints
• oil painting — Noun – English ～ the art or method of painting with oil paints
• os palatinum — Noun – English ～ either of two irregularly shaped bones that form the back of the hard palate and helps to form the nasal cavity and the floor of the orbits
• oil palm — Noun – English ～ pinnate-leaved palms of the genus Elaeis having dense clusters of crowded flowers and bright red fruit and yielding high quality palm oils
• order Palmales — Noun – English ～ coextensive with the family Palmae: palms
• Oryzomys palustris — Noun – English ～ hardy agile rat of grassy marshes of Mexico and the southeastern United States
• omelet pan — Noun – English ～ pan for cooking omelets
• omelette pan — Noun – English ～ pan for cooking omelets
• order Pandanales — Noun – English ～ families Typhaceae; Sparganiaceae; Pandanaceae
• order Papaverales — Noun – English ～ an order of dicotyledonous plants
• order paper — Noun – English ～ a printed copy of the order of the day
• Oncidium papilio kramerianum — Noun – English ～ orchid of South and Central America having flowers similar to but smaller than Psychopsis papilio; sometimes placed in genus Oncidium

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