| Oromë | Organic acid | Organic |
| Ornament (music)In music, ornaments are musical flourishes that are not necessary to the overall melodic (or harmonic) line, but serve to decorate or "ornament" that line. The amount of ornamentation in a piece of music can vary from quite extensive (it was often so in t | OratorOrator is a Latin word for speaker (from the Latin verb oro meaning "I speak" or "I pray"). In ancient Rome, the art of speaking in public Ars Oratoria was a professional competence especially cultivated by politicians and lawyers. It later was developed | Original equipment manufacturerOEM is an acronym for Original Equipment Manufacturer . An OEM is a company that builds components that are used in systems sold by another company called a value-added reseller or VAR. The practice of a VAR selling products with components from OEMs is c |
| Oresund BridgeThe Oresund Bridge (joint Danish/ Swedish hybrid name: resundsbron is a combined two-track rail and four-lane road bridge across the Oresund strait. It connects the two metropolitan areas of the Oresund Region, the Danish capital of Copenhagen with the Sw | OrthopteraOrder: Orthoptera Suborder: Caelifera Acrididae Charilaidae Dericorythidae Eumastacidae Euschmidtiidae Lathiceridae Lentulidae Lithidiidae Ommexechidae Pamphagidae Pneumoridae Pyrgacrididae Pyrgomorphidae Romaleidae Tanaoceridae Tetrigidae Thericleidae Tr | Orange (colour)See also Orange for other meanings of the word. The colour orange occurs between red and yellow in the visible spectrum at a wavelength of about 620-585 nanometres. It is the same colour as the fruit for which it was named. With natural colouring material |
| Orange (fruit)Oranges are the fruits of an orange tree, one of the most common citrus fruits. Oranges are widely grown in warmer climates and are distributed worldwide. The name "orange" refers both to the fruit and its color — the color is named for the fruit. The fla | Orange (company)See also Orange (disambiguation) for other meanings of the word. Orange is a major telecommunications company, initially a division of Hutchison Whampoa and a successor to their failed point to point mobile telephone system known as Rabbit. Despite being | Organic farmingOrganic farming is a way of farming that avoids the use of synthetic chemicals and genetically modified organisms (GMOs), and, according to its proponents, follows the principles of sustainable agriculture. Its theoretical basis puts an emphasis on soil h |
| Orlando Magic | Order of the Garter | Orange County, Florida |
| Or | Orléans | Order of the Arrow |
| Oregon City, Oregon | Oratory of the Paraclete | Orchamus |
| Orestes (mythology) | Oreithyia | Oratorio |
| Orosius | Orchomenus | Orpheus |
| Orgel's rule | Orthrus | Orphne |
| Oread | Orphans of the Sky | Orange, France |
| Ordnance Survey | Orcus | Orbona |
| Orbital maneuvering system | Orinoco | Orwellian |
| Origins of chess | Orne | Orange County, Virginia |
| Orleans County, Vermont | Orange County, Vermont | Orangeburg County, South Carolina |
| Ornithine | Orange County, North Carolina | Orpington |
| Oregon County, Missouri | Orkneyinga saga | Orange County, Indiana |
| Oro | Orbital elements | Orunmila |
| Orange Beach, Alabama | Orlando, Florida | Orthostatic hypotension |
| Orthogonality | Ornithine decarboxylase | Orpheus Island National Park |
| Orrville, Alabama | Orthogonal matrix | Ordinary People |
| Oro Valley, Arizona | Oracle, Arizona | Oroville, California |
| Oroville East, California | Orinda, California | Orange Cove, California |
| Orland, California | Orange, California | Orangevale, California |
| Orcutt, California | Orosi, California | Ordway, Colorado |
| Orchard City, Colorado | Orchard Mesa, Colorado | Orange Park, Florida |
| Orangetree, Florida | Orchid, Florida | Orlovista, Florida |
| Orange City, Florida | Ormond Beach, Florida | Ormond-By-The-Sea, Florida |
| Orchard Hill, Georgia | Orchidlands Estates, Hawaii | Orofino, Idaho |
| Orland Hills, Illinois | Orland Park, Illinois | Orient, Illinois |
| Orion, Illinois | Oreana, Illinois | Oregon, Illinois |
| Orangeville, Illinois | Orestes, Indiana | Orleans, Indiana |
| Orland, Indiana | Orient, Iowa | Orleans, Iowa |
| Orchard, Iowa | Orange City, Iowa | Orchard Grass Hills, Kentucky |
| Orient, Maine | Orland, Maine | Orrington, Maine |
