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Look up OP, op, or op. in Wiktionary, the free dictionary. |
OP, O.P., or Op may refer to any of the following:
- Observation post, a position from which soldiers can watch enemy movements
- Ocean Pacific, a retail company based in California, United States
- Orange pekoe, a term used in the Western tea trade to describe a particular grade of black teas
- Orange peel, the outer layer of an orange fruit
- Ordo Praedicatorum, commonly known as the Dominican Order, a Catholic religious order
- Operating Procedure, a standardised working protocol
- Operating Profit, a measure of business profitability
- Out of print, a status of a book title at a publishing house
- op, a slang term for marijuana grow operation
- op, Open pollination
- Mathematics
- Operator (mathematics), a mapping from one vector space or module to another
- Op (statistics), a symbol used in probability mathematics
- Octagonal prism, a prism formed by square sides and two regular octagon caps
- Culture
- Op art, also known as optical art, a style of visual art that makes use of optical illusions
- Op-ed, a newspaper opinion piece of a writer unaffiliated with the editorial board
- Opposite prompt, the right side of a theatre stage
- Op., an abbreviation for Opus number, used to denote one work of musical composition from many
- Op. cit., an abbreviation for the Latin term opus citatum est, meaning "the work has been cited"
- Optimus Prime (Transformers), a character from the Transformers franchise
- One Piece, a Japanese manga and anime created by Eiichiro Oda
- a shortening for Opening credits, more often used in anime by fans
- Internet and gaming
- Original poster or original post, a term used on online forums to denote the first poster/post
- Overpowered, a term used to note that a particular aspect or character in a game is unbalanced and thereby too strong.
- Overpriced, a term used mostly on online games to note about an item that is being marketed for a price higher than normal
- a channel operator on an Internet Relay Chat
- Education
- Oratory Preparatory School, a Catholic preparatory day school for boys in New Jersey, United States
- Overall Position, the grade appointed to Queensland high-school graduates
- Old Persean, an ex-pupil of The Perse School, Cambridge, England
- Old Pauline, an ex-pupil of St Paul's School, London
- Old Pangbournian, an ex pupil of Pangbourne College
- Geography
- Oak Park, Illinois, a village west of Chicago, United States
- Oakland Park, Florida, a city in the Fort Lauderdale Metropolian Area
- Orchard Park, New York, a town south of Buffalo, New York, United States
- Overland Park, Kansas, a city in the Kansas City Metropolitan Area
- Ohio Penitentiary, a now demolished prison formerly located in Columbus, Ohio
- Science and medicine
- the Oropharyngeal airway, leading from the mouth to the pharynx
- Organophosphate, the general name for esters of phosphoric acid
- Osteitis pubis, a medical condition which is prevalent among players of Australian rules football
- Osteoporosis, a degenerative disease of the bones that leads to an increased risk of fracture
- a short-hand slang term for a surgical operation
See also [link]
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This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article. |
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Dominican Order
The Order of Preachers (Latin: Ordo Praedicatorum, hence the abbreviation OP used by members), more commonly known after the 15th century as the Dominican Order or Dominicans, is a Roman Catholic religious order founded by the Spanish priest Saint Dominic de Guzman in France and approved by Pope Honorius III (1216–27) on 22 December 1216. Membership in this "mendicant" Order includes friars, nuns, active sisters, and lay or secular Dominicans (formerly known as tertiaries, though recently there has been a growing number of Associates, who are unrelated to the tertiaries) affiliated with the Order.
Founded to preach the Gospel and to combat heresy, the teaching activity of the order and its scholastic organization placed the Preachers in the forefront of the intellectual life of the Middle Ages. The order is famed for its intellectual tradition, having produced many leading theologians and philosophers. The Dominican Order is headed by the Master of the Order, who is currently Bruno Cadoré. Members of the order generally carry the letters O.P., standing for Ordinis Praedicatorum, meaning of the Order of Preachers, after their names.
Phosphorus pentoxide
Phosphorus pentoxide is a chemical compound with molecular formula P4O10 (with its common name derived from its empirical formula, P2O5). This white crystalline solid is the anhydride of phosphoric acid. It is a powerful desiccant and dehydrating agent.
Structure
Phosphorus pentoxide crystallizes in at least four forms or polymorphs. The most familiar one, a metastable form, shown in the figure, comprises molecules of P4O10. Weak van der Waals forces hold these molecules together in a hexagonal lattice (However, in spite of the high symmetry of the molecules, the crystal packing is not a close packing). The structure of the P4O10 cage is reminiscent of adamantane with Tdsymmetry point group. It is closely related to the corresponding anhydride of phosphorous acid, P4O6. The latter lacks terminal oxo groups. Its density is 2.30 g/cm3. It boils at 423 °C under atmospheric pressure; if heated more rapidly it can sublimate. This form can be made by condensing the vapor of phosphorus pentoxide rapidly, the result is an extremely hygroscopic solid.
