Nouns starting with O that are validated

• 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
• octameter — Noun – English ～ a verse line having eight metrical feet
• octane — Noun – English ～ any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent
• octane number — Noun – English ～ a measure of the antiknock properties of gasoline
• octanedioic acid — Noun – English ～ a dicarboxylic acid found in cork
• Octans — Noun – English ～ the constellation that includes the southern celestial pole
• octant — Noun – English ～ a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration
• octave — Noun – English ～ a rhythmic group of eight lines of verse
• octave — Noun – English ～ a feast day and the seven days following it

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