Nouns in english starting with O

• ochotona — Noun – English ～ type genus of the Ochotonidae
• Ochotonidae — Noun – English ～ pikas and extinct forms
• ochre — Noun – English ～ a moderate yellow-orange to orange color
• ochre — Noun – English ～ any of various earths containing silica and alumina and ferric oxide; used as a pigment
• Ochroma — Noun – English ～ one species: balsa
• Ochroma lagopus — Noun – English ～ forest tree of lowland Central America having a strong very light wood; used for making floats and rafts and in crafts
• ochronosis — Noun – English ～ an accumulation of dark pigment in cartilage and other connective tissue; usually a symptom of alkaptonuria or phenol poisoning
• ochs — Noun – English ～ United States newspaper publisher (1858-1935)
• Ocimum basilicum — Noun – English ～ annual or perennial of tropical Asia having spikes of small white flowers and aromatic leaves; one of the most important culinary herbs; used in salads, casseroles, sauces and some liqueurs
• Ocimum — Noun – English ～ basil
• ockham — Noun – English ～ English scholastic philosopher and assumed author of Occam's Razor (1285-1349)
• oconee bells — Noun – English ～ plant of southeastern United States having solitary white funnel-shaped flowers flushed with pink and large glossy green leaves that turn bronze-red in fall
• ocotillo — Noun – English ～ desert shrub of southwestern United States and Mexico having slender naked spiny branches that after the rainy season put forth foliage and clusters of red flowers
• oct — Noun – English ～ the month following September and preceding November
• octad — Noun – English ～ the cardinal number that is the sum of seven and one
• octadecanoic acid — Noun – English ～ a waxy saturated fatty acid; occurs widely as a glyceride in animal and vegetable fats
• octagon — Noun – English ～ an eight-sided polygon
• octahedron — Noun – English ～ any polyhedron having eight plane faces
• octal notation — Noun – English ～ any mathematical notation that uses 8 different characters (usually the digits 0 to 7)
• octal digit — Noun – English ～ a digit from 0 to 7 in octal notation

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