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Ortho- is a Greek prefix meaning “straight”, “upright”, “right” or “correct”. Ortho may refer to: *
Ortho, Belgium Ortho (; ) is a village of Wallonia and a district of the municipality of La Roche-en-Ardenne, located in the Luxembourg (Belgium), province of Luxembourg, Belgium. The village is located at an altitude of above sea level. It consists of houses ...
, a village in the Belgian province of Luxembourg


Science

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List of commonly used taxonomic affixes This is a list of common affixes used when scientifically naming species, particularly extinct species for whom only their scientific names are used, along with their derivations. *a-, an-: ''Pronunciation'': /ə/, /a/, /ən/, /an/. ''Origin ...
(ortho-) *
Arene substitution patterns Arene substitution patterns are part of organic chemistry IUPAC nomenclature and pinpoint the position of substituents other than hydrogen in relation to each other on an aromatic hydrocarbon. ''Ortho'', ''meta'', and ''para'' substitution * ...
, two substituents that occupy adjacent positions on an aromatic ring *
Chlordane Chlordane, or chlordan, is an organochlorine compound that was used as a pesticide. It is a white solid. In the United States, chlordane was used for termite-treatment of approximately 30 million homes until it was banned in 1988. Chlordane was b ...
, an organochlorine compound that was used as a pesticide


Mathematics

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Orthogonal In mathematics, orthogonality (mathematics), orthogonality is the generalization of the geometric notion of ''perpendicularity''. Although many authors use the two terms ''perpendicular'' and ''orthogonal'' interchangeably, the term ''perpendic ...
, a synonym for perpendicular *
Orthonormal In linear algebra, two vectors in an inner product space are orthonormal if they are orthogonal unit vectors. A unit vector means that the vector has a length of 1, which is also known as normalized. Orthogonal means that the vectors are all perpe ...
, the property that a collection of vectors are mutually perpendicular and each of unit magnitude * Orthodrome, a synonym for
great circle In mathematics, a great circle or orthodrome is the circular intersection of a sphere and a plane passing through the sphere's center point. Discussion Any arc of a great circle is a geodesic of the sphere, so that great circles in spher ...
, a geodesic on the sphere *
Orthographic projection Orthographic projection (also orthogonal projection and analemma) is a means of representing Three-dimensional space, three-dimensional objects in Plane (mathematics), two dimensions. Orthographic projection is a form of parallel projection in ...
, a parallel projection onto a perpendicular plane


Medicine

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Orthomyxovirus ''Orthomyxoviridae'' () is a family of negative-sense RNA viruses. It includes nine genera: '' Alphainfluenzavirus'', '' Betainfluenzavirus'', '' Gammainfluenzavirus'', '' Deltainfluenzavirus'', '' Isavirus'', '' Mykissvirus'', '' Quaranjavir ...
, a family of viruses to which influenza belongs *
Orthodontics Orthodontics (also referred to as orthodontia) is a dentistry specialty that addresses the diagnosis, prevention, management, and correction of mal-positioned teeth and jaws, as well as misaligned bite patterns. It may also address the modificati ...
, a specialty of dentistry concerned with the study and treatment of malocclusions *
Orthopedic Orthopedic surgery or orthopedics ( alternative spelling orthopaedics) is the branch of surgery concerned with conditions involving the musculoskeletal system. Orthopedic surgeons use both surgical and nonsurgical means to treat musculoskeletal ...
, the study of the musculoskeletal system *
Ortho-DOT Ortho-DOT, or 4,5-dimethoxy-2-methylthioamphetamine, is a lesser-known psychedelic drug. Ortho-DOT was first synthesized by Alexander Shulgin. In his book '' PiHKAL (Phenethylamines i Have Known And Loved)'', neither the dosage nor the duration ...
, a psychedelic drug *
Ortho-cept Ethinylestradiol/desogestrel (EE/DSG), sold under the brand name Marvelon among others, is a fixed-dose combination of ethinylestradiol (EE), an estrogen, and desogestrel (DSG), a progestin, which is used as a birth control pill to prevent p ...
and Ortho Tri-cyclen, kinds of oral contraceptive drug


Theology

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Orthodoxy Orthodoxy () is adherence to a purported "correct" or otherwise mainstream- or classically-accepted creed, especially in religion. Orthodoxy within Christianity refers to acceptance of the doctrines defined by various creeds and ecumenical co ...
, right (correct) belief *
Orthopraxy In the study of religion, orthopraxy is correct conduct, both ethical and liturgical, as opposed to faith or grace. Orthopraxy is in contrast with orthodoxy, which emphasizes correct belief. The word is a neoclassical compound— () meaning ...
, right (correct) action


Business

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Ortho Pharmaceutical Ortho Pharmaceutical was initially formed in the United States in 1931 as a subsidiary of Johnson & Johnson to market the first medical prescription, prescription spermicide, spermicidal contraceptive jelly, ''Ortho-Gynol''. History In the 194 ...
, which merged into Ortho-McNeil Pharmaceutical before being bought by Johnson & Johnson *
Ortho-Clinical Diagnostics Ortho Clinical Diagnostics (now QuidelOrtho) is an in vitro diagnostics company that made products and diagnostic equipment for blood testing. Ortho served two primary industries in the medical field: clinical laboratories, by producing plat ...
, a subsidiary of Quidel Corporation * Ortho, a lawn care and pesticide company owned by the
Scotts Miracle-Gro Company The Scotts Miracle-Gro Company is an American multinational corporation headquartered in Marysville, Ohio, where O.M. Scott began selling lawn seed in 1868. The company manufactures and sells consumer lawn, garden and pest control products, as ...


See also

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Orthos (disambiguation) Orthos can refer to: * ''Orthos'' (skipper), a genus of butterfly in the grass skipper family * Orthos (Thessaly), a city of ancient Thessaly, Greece * A two-headed dog in Greek mythology, also known as Orthrus See also * Orthros, the mati ...
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Ortho Mode Transducer An orthomode transducer (OMT) is a waveguide component that is commonly referred to as a ''polarisation duplexer''. ''Orthomode'' is a contraction of ''orthogonal mode''. Orthomode transducers serve either to combine or to separate two ortho ...
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Orthochromatic In chemistry, orthochromasia is the property of a dye or stain to not change color on binding to a target, as opposed to ''metachromatic'' stains, which do change color. The word is derived from the Greek '' orthos'' (correct, upright), and chr ...
* Orthophotography *
Orthoptera Orthoptera () is an order of insects that comprises the grasshoppers, locusts, and crickets, including closely related insects, such as the bush crickets or katydids and wētā. The order is subdivided into two suborders: Caelifera – gras ...
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