Ortho- is a Greek prefix meaning “straight”, “upright”, “right” or “correct”. Ortho may refer to: *

Ortho, Belgium Ortho ( wa, Ortô) is a village of Wallonia and a district of the municipality of La Roche-en-Ardenne, located in the province of Luxembourg, Belgium. The village is located at an altitude of above sea level. It consists of houses built mainly d ...

, a village in the Belgian province of

Luxembourg Luxembourg ( ; lb, Lëtzebuerg ; french: link=no, Luxembourg; german: link=no, Luxemburg), officially the Grand Duchy of Luxembourg, ; french: link=no, Grand-Duché de Luxembourg ; german: link=no, Großherzogtum Luxemburg is a small lan ...

In science *

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 * I ...

, 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 In mathematics: *

Orthogonal In mathematics, orthogonality is the generalization of the geometric notion of ''perpendicularity''. By extension, orthogonality is also used to refer to the separation of specific features of a system. The term also has specialized meanings in ...

, a synonym for perpendicular *

Orthonormal In linear algebra, two vectors in an inner product space are orthonormal if they are orthogonal (or perpendicular along a line) unit vectors. A set of vectors form an orthonormal set if all vectors in the set are mutually orthogonal and all of un ...

, 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. Any arc of a great circle is a geodesic of the sphere, so that great circles in spherical geomet ...

, 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 Two-dimensional space, two dimensions. Orthographic projection is a form of parallel projection in ...

, a parallel projection onto a perpendicular plane In medicine: *

Orthomyxovirus ''Orthomyxoviridae'' (from Greek ὀρθός, ''orthós'' 'straight' + μύξα, ''mýxa'' 'mucus') is a family of negative-sense RNA viruses. It includes seven genera: '' Alphainfluenzavirus'', '' Betainfluenzavirus'', '' Gammainfluenzavirus'' ...

, a family of viruses to which influenza belongs *

Orthodontics Orthodontics is a dentistry specialty that addresses the diagnosis, prevention, management, and correction of mal-positioned teeth and jaws, and misaligned bite patterns. It may also address the modification of facial growth, known as dentofacial ...

, a specialty of dentistry concerned with the study and treatment of malocclusions *

Orthopedic Orthopedic surgery or orthopedics ( alternatively spelt 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 ...

, a psychedelic drug *

Ortho-cept Desogestrel/ethinylestradiol (EE/DSG), sold under the brand name Marvelon among others, is a fixed-dose combination of desogestrel (DSG), a progestin, and ethinylestradiol (EE), an estrogen, which is used as a birth control pill to prevent pregn ...

and Ortho Tri-cyclen, kinds of oral contraceptive drug In theology: *

Orthodoxy Orthodoxy (from Greek: ) is adherence to correct or accepted creeds, especially in religion. Orthodoxy within Christianity refers to acceptance of the doctrines defined by various creeds and ecumenical councils in Antiquity, but different Churc ...

, 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 'r ...

, right (correct) action In business: *

Ortho Pharmaceutical Ortho Pharmaceutical was initially formed in the United States in 1931 as a subsidiary of Johnson & Johnson to market the first prescription spermicidal contraceptive jelly, ''Ortho-Gynol''. History In the 1940s, Ortho introduced the coil-s ...

, which merged into Ortho-McNeil Pharmaceutical before being bought by Johnson & Johnson *

Ortho-Clinical Diagnostics Ortho Clinical Diagnostics is an in vitro diagnostics company that makes products and diagnostic equipment for blood testing. Ortho serves two primary industries in the medical field: clinical laboratories, by producing platforms and assays tha ...

, another subsidiary of Johnson & Johnson * Ortho, a lawn care and

pesticide Pesticides are substances that are meant to control pests. This includes herbicide, insecticide, nematicide, molluscicide, piscicide, avicide, rodenticide, bactericide, insect repellent, animal repellent, microbicide, fungicide, and lampri ...

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, an ...

See also